diff --git a/docs/root/_static/searchtools.js b/docs/root/_static/searchtools.js
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+/*
+ * searchtools.js
+ * ~~~~~~~~~~~~~~~~
+ *
+ * Sphinx JavaScript utilities for the full-text search.
+ *
+ * :copyright: Copyright 2007-2020 by the Sphinx team, see AUTHORS.
+ * :license: BSD, see LICENSE for details.
+ *
+ */
+
+if (!Scorer) {
+  /**
+   * Simple result scoring code.
+   */
+  var Scorer = {
+    // Implement the following function to further tweak the score for each result
+    // The function takes a result array [filename, title, anchor, descr, score]
+    // and returns the new score.
+    /*
+      score: function(result) {
+        return result[4];
+      },
+      */
+
+    // query matches the full name of an object
+    objNameMatch: 11,
+    // or matches in the last dotted part of the object name
+    objPartialMatch: 6,
+    // Additive scores depending on the priority of the object
+    objPrio: {
+      0: 15, // used to be importantResults
+      1: 5, // used to be objectResults
+      2: -5,
+    }, // used to be unimportantResults
+    //  Used when the priority is not in the mapping.
+    objPrioDefault: 0,
+
+    // query found in title
+    title: 15,
+    partialTitle: 7,
+    // query found in terms
+    term: 5,
+    partialTerm: 2,
+  };
+}
+
+if (!splitQuery) {
+  function splitQuery(query) {
+    return query.split(/\s+/);
+  }
+}
+
+/**
+ * Search Module
+ */
+var Search = {
+  _index: null,
+  _queued_query: null,
+  _pulse_status: -1,
+
+  htmlToText: function (htmlString) {
+    var htmlElement = document.createElement("span");
+    htmlElement.innerHTML = htmlString;
+    $(htmlElement).find(".headerlink").remove();
+    docContent = $(htmlElement).find("[role=main]")[0];
+    if (docContent === undefined) {
+      console.warn(
+        "Content block not found. Sphinx search tries to obtain it " +
+          "via '[role=main]'. Could you check your theme or template."
+      );
+      return "";
+    }
+    return docContent.textContent || docContent.innerText;
+  },
+
+  init: function () {
+    var params = $.getQueryParameters();
+    if (params.q) {
+      var query = params.q[0];
+      $('input[name="q"]')[0].value = query;
+      this.performSearch(query);
+    }
+  },
+
+  loadIndex: function (url) {
+    $.ajax({
+      type: "GET",
+      url: url,
+      data: null,
+      dataType: "script",
+      cache: true,
+      complete: function (jqxhr, textstatus) {
+        if (textstatus != "success") {
+          document.getElementById("searchindexloader").src = url;
+        }
+      },
+    });
+  },
+
+  setIndex: function (index) {
+    var q;
+    this._index = index;
+    if ((q = this._queued_query) !== null) {
+      this._queued_query = null;
+      Search.query(q);
+    }
+  },
+
+  hasIndex: function () {
+    return this._index !== null;
+  },
+
+  deferQuery: function (query) {
+    this._queued_query = query;
+  },
+
+  stopPulse: function () {
+    this._pulse_status = 0;
+  },
+
+  startPulse: function () {
+    if (this._pulse_status >= 0) return;
+    function pulse() {
+      var i;
+      Search._pulse_status = (Search._pulse_status + 1) % 4;
+      var dotString = "";
+      for (i = 0; i < Search._pulse_status; i++) dotString += ".";
+      Search.dots.text(dotString);
+      if (Search._pulse_status > -1) window.setTimeout(pulse, 500);
+    }
+    pulse();
+  },
+
+  /**
+   * perform a search for something (or wait until index is loaded)
+   */
+  performSearch: function (query) {
+    // create the required interface elements
+    this.out = $("#search-results");
+    this.title = $("<h2>" + _("Searching") + "</h2>").appendTo(this.out);
+    this.dots = $("<span></span>").appendTo(this.title);
+    this.status = $('<p class="search-summary">&nbsp;</p>').appendTo(this.out);
+    this.output = $('<ul class="search"/>').appendTo(this.out);
+
+    $("#search-progress").text(_("Preparing search..."));
+    this.startPulse();
+
+    // index already loaded, the browser was quick!
+    if (this.hasIndex()) this.query(query);
+    else this.deferQuery(query);
+  },
+
+  /**
+   * execute search (requires search index to be loaded)
+   */
+  query: function (query) {
+    var i;
+
+    // stem the searchterms and add them to the correct list
+    var stemmer = new Stemmer();
+    var searchterms = [];
+    var excluded = [];
+    var hlterms = [];
+    var tmp = splitQuery(query);
+    var objectterms = [];
+    for (i = 0; i < tmp.length; i++) {
+      if (tmp[i] !== "") {
+        objectterms.push(tmp[i].toLowerCase());
+      }
+
+      if ($u.indexOf(stopwords, tmp[i].toLowerCase()) != -1 || tmp[i] === "") {
+        // skip this "word"
+        continue;
+      }
+      // stem the word
+      var word = stemmer.stemWord(tmp[i].toLowerCase());
+      // prevent stemmer from cutting word smaller than two chars
+      if (word.length < 3 && tmp[i].length >= 3) {
+        word = tmp[i];
+      }
+      var toAppend;
+      // select the correct list
+      if (word[0] == "-") {
+        toAppend = excluded;
+        word = word.substr(1);
+      } else {
+        toAppend = searchterms;
+        hlterms.push(tmp[i].toLowerCase());
+      }
+      // only add if not already in the list
+      if (!$u.contains(toAppend, word)) toAppend.push(word);
+    }
+    var highlightstring = "?highlight=" + $.urlencode(hlterms.join(" "));
+
+    // console.debug('SEARCH: searching for:');
+    // console.info('required: ', searchterms);
+    // console.info('excluded: ', excluded);
+
+    // prepare search
+    var terms = this._index.terms;
+    var titleterms = this._index.titleterms;
+
+    // array of [filename, title, anchor, descr, score]
+    var results = [];
+    $("#search-progress").empty();
+
+    // lookup as object
+    for (i = 0; i < objectterms.length; i++) {
+      var others = [].concat(
+        objectterms.slice(0, i),
+        objectterms.slice(i + 1, objectterms.length)
+      );
+      results = results.concat(
+        this.performObjectSearch(objectterms[i], others)
+      );
+    }
+
+    // lookup as search terms in fulltext
+    results = results.concat(
+      this.performTermsSearch(searchterms, excluded, terms, titleterms)
+    );
+
+    // let the scorer override scores with a custom scoring function
+    if (Scorer.score) {
+      for (i = 0; i < results.length; i++)
+        results[i][4] = Scorer.score(results[i]);
+    }
+
+    // now sort the results by score (in opposite order of appearance, since the
+    // display function below uses pop() to retrieve items) and then
+    // alphabetically
+    results.sort(function (a, b) {
+      var left = a[4];
+      var right = b[4];
+      if (left > right) {
+        return 1;
+      } else if (left < right) {
+        return -1;
+      } else {
+        // same score: sort alphabetically
+        left = a[1].toLowerCase();
+        right = b[1].toLowerCase();
+        return left > right ? -1 : left < right ? 1 : 0;
+      }
+    });
+
+    // for debugging
+    //Search.lastresults = results.slice();  // a copy
+    //console.info('search results:', Search.lastresults);
+
+    // print the results
+    var resultCount = results.length;
+    function displayNextItem() {
+      // results left, load the summary and display it
+      if (results.length) {
+        var item = results.pop();
+        var listItem = $('<li style="display:none"></li>');
+        var requestUrl = "";
+        var linkUrl = "";
+        if (DOCUMENTATION_OPTIONS.BUILDER === "dirhtml") {
+          // dirhtml builder
+          var dirname = item[0] + "/";
+          if (dirname.match(/\/index\/$/)) {
+            dirname = dirname.substring(0, dirname.length - 6);
+          } else if (dirname == "index/") {
+            dirname = "";
+          }
+          requestUrl = DOCUMENTATION_OPTIONS.URL_ROOT + dirname;
+          linkUrl = requestUrl;
+        } else {
+          // normal html builders
+          requestUrl =
+            DOCUMENTATION_OPTIONS.URL_ROOT +
+            item[0] +
+            DOCUMENTATION_OPTIONS.FILE_SUFFIX;
+          linkUrl = item[0] + DOCUMENTATION_OPTIONS.LINK_SUFFIX;
+        }
+        listItem.append(
+          $("<a/>")
+            .attr("href", linkUrl + highlightstring + item[2])
+            .html(item[1])
+        );
+        if (item[3]) {
+          listItem.append($("<span> (" + item[3] + ")</span>"));
+          Search.output.append(listItem);
+          listItem.slideDown(5, function () {
+            displayNextItem();
+          });
+        } else if (DOCUMENTATION_OPTIONS.HAS_SOURCE) {
+          $.ajax({
+            url: requestUrl,
+            dataType: "text",
+            complete: function (jqxhr, textstatus) {
+              var data = jqxhr.responseText;
+              if (data !== "" && data !== undefined) {
+                listItem.append(
+                  Search.makeSearchSummary(data, searchterms, hlterms)
+                );
+              }
+              Search.output.append(listItem);
+              listItem.slideDown(5, function () {
+                displayNextItem();
+              });
+            },
+          });
+        } else {
+          // no source available, just display title
+          Search.output.append(listItem);
+          listItem.slideDown(5, function () {
+            displayNextItem();
+          });
+        }
+      }
+      // search finished, update title and status message
+      else {
+        Search.stopPulse();
+        Search.title.text(_("Search Results"));
+        if (!resultCount)
+          Search.status.text(
+            _(
+              "Your search did not match any documents. Please make sure that all words are spelled correctly and that you've selected enough categories."
+            )
+          );
+        else
+          Search.status.text(
+            _(
+              "Search finished, found %s page(s) matching the search query."
+            ).replace("%s", resultCount)
+          );
+        Search.status.fadeIn(500);
+      }
+    }
+    displayNextItem();
+  },
+
+  /**
+   * search for object names
+   */
+  performObjectSearch: function (object, otherterms) {
+    var filenames = this._index.filenames;
+    var docnames = this._index.docnames;
+    var objects = this._index.objects;
+    var objnames = this._index.objnames;
+    var titles = this._index.titles;
+
+    var i;
+    var results = [];
+
+    for (var prefix in objects) {
+      for (var name in objects[prefix]) {
+        var fullname = (prefix ? prefix + "." : "") + name;
+        var fullnameLower = fullname.toLowerCase();
+        if (fullnameLower.indexOf(object) > -1) {
+          var score = 0;
+          var parts = fullnameLower.split(".");
+          // check for different match types: exact matches of full name or
+          // "last name" (i.e. last dotted part)
+          if (fullnameLower == object || parts[parts.length - 1] == object) {
+            score += Scorer.objNameMatch;
+            // matches in last name
+          } else if (parts[parts.length - 1].indexOf(object) > -1) {
+            score += Scorer.objPartialMatch;
+          }
+          var match = objects[prefix][name];
+          var objname = objnames[match[1]][2];
+          var title = titles[match[0]];
+          // If more than one term searched for, we require other words to be
+          // found in the name/title/description
+          if (otherterms.length > 0) {
+            var haystack = (
+              prefix +
+              " " +
+              name +
+              " " +
+              objname +
+              " " +
+              title
+            ).toLowerCase();
+            var allfound = true;
+            for (i = 0; i < otherterms.length; i++) {
+              if (haystack.indexOf(otherterms[i]) == -1) {
+                allfound = false;
+                break;
+              }
+            }
+            if (!allfound) {
+              continue;
+            }
+          }
+          var descr = objname + _(", in ") + title;
+
+          var anchor = match[3];
+          if (anchor === "") anchor = fullname;
+          else if (anchor == "-")
+            anchor = objnames[match[1]][1] + "-" + fullname;
+          // add custom score for some objects according to scorer
+          if (Scorer.objPrio.hasOwnProperty(match[2])) {
+            score += Scorer.objPrio[match[2]];
+          } else {
+            score += Scorer.objPrioDefault;
+          }
+          results.push([
+            docnames[match[0]],
+            fullname,
+            "#" + anchor,
+            descr,
+            score,
+            filenames[match[0]],
+          ]);
+        }
+      }
+    }
+
+    return results;
+  },
+
+  /**
+   * search for full-text terms in the index
+   */
+  performTermsSearch: function (searchterms, excluded, terms, titleterms) {
+    var docnames = this._index.docnames;
+    var filenames = this._index.filenames;
+    var titles = this._index.titles;
+
+    var i, j, file;
+    var fileMap = {};
+    var scoreMap = {};
+    var results = [];
+
+    // perform the search on the required terms
+    for (i = 0; i < searchterms.length; i++) {
+      var word = searchterms[i];
+      var files = [];
+      var _o = [
+        { files: terms[word], score: Scorer.term },
+        { files: titleterms[word], score: Scorer.title },
+      ];
+      // add support for partial matches
+      if (word.length > 2) {
+        for (var w in terms) {
+          if (w.match(word) && !terms[word]) {
+            _o.push({ files: terms[w], score: Scorer.partialTerm });
+          }
+        }
+        for (var w in titleterms) {
+          if (w.match(word) && !titleterms[word]) {
+            _o.push({ files: titleterms[w], score: Scorer.partialTitle });
+          }
+        }
+      }
+
+      // no match but word was a required one
+      if (
+        $u.every(_o, function (o) {
+          return o.files === undefined;
+        })
+      ) {
+        break;
+      }
+      // found search word in contents
+      $u.each(_o, function (o) {
+        var _files = o.files;
+        if (_files === undefined) return;
+
+        if (_files.length === undefined) _files = [_files];
+        files = files.concat(_files);
+
+        // set score for the word in each file to Scorer.term
+        for (j = 0; j < _files.length; j++) {
+          file = _files[j];
+          if (!(file in scoreMap)) scoreMap[file] = {};
+          scoreMap[file][word] = o.score;
+        }
+      });
+
+      // create the mapping
+      for (j = 0; j < files.length; j++) {
+        file = files[j];
+        if (file in fileMap && fileMap[file].indexOf(word) === -1)
+          fileMap[file].push(word);
+        else fileMap[file] = [word];
+      }
+    }
+
+    // now check if the files don't contain excluded terms
+    for (file in fileMap) {
+      var valid = true;
+
+      // check if all requirements are matched
+      var filteredTermCount = searchterms.filter(function (term) { // as search terms with length < 3 are discarded: ignore
+        return term.length > 2;
+      }).length;
+      if (
+        fileMap[file].length != searchterms.length &&
+        fileMap[file].length != filteredTermCount
+      )
+        continue;
+
+      // ensure that none of the excluded terms is in the search result
+      for (i = 0; i < excluded.length; i++) {
+        if (
+          terms[excluded[i]] == file ||
+          titleterms[excluded[i]] == file ||
+          $u.contains(terms[excluded[i]] || [], file) ||
+          $u.contains(titleterms[excluded[i]] || [], file)
+        ) {
+          valid = false;
+          break;
+        }
+      }
+
+      // if we have still a valid result we can add it to the result list
+      if (valid) {
+        // select one (max) score for the file.
+        // for better ranking, we should calculate ranking by using words statistics like basic tf-idf...
+        var score = $u.max(
+          $u.map(fileMap[file], function (w) {
+            return scoreMap[file][w];
+          })
+        );
+        results.push([
+          docnames[file],
+          titles[file],
+          "",
+          null,
+          score,
+          filenames[file],
+        ]);
+      }
+    }
+    return results;
+  },
+
+  /**
+   * helper function to return a node containing the
+   * search summary for a given text. keywords is a list
+   * of stemmed words, hlwords is the list of normal, unstemmed
+   * words. the first one is used to find the occurrence, the
+   * latter for highlighting it.
+   */
+  makeSearchSummary: function (htmlText, keywords, hlwords) {
+    var text = Search.htmlToText(htmlText);
+    var textLower = text.toLowerCase();
+    var start = 0;
+    $.each(keywords, function () {
+      var i = textLower.indexOf(this.toLowerCase());
+      if (i > -1) start = i;
+    });
+    start = Math.max(start - 120, 0);
+    var excerpt =
+      (start > 0 ? "..." : "") +
+      $.trim(text.substr(start, 240)) +
+      (start + 240 - text.length ? "..." : "");
+    var rv = $('<div class="context"></div>').text(excerpt);
+    $.each(hlwords, function () {
+      rv = rv.highlightText(this, "highlighted");
+    });
+    return rv;
+  },
+};
+
+$(document).ready(function () {
+  Search.init();
+});