Include headers also when copying stream stats

This is for plain text copy format.

This also replaces any newlines in the header text with a space to maintain
formatting.

client/streamstatswindow.ui

@@ -19,6 +19,9 @@
      <property name="contextMenuPolicy">
       <enum>Qt::ActionsContextMenu</enum>
      </property>
+     <property name="selectionBehavior">
+       <enum>QAbstractItemView::SelectRows</enum>
+     </property>
      <property name="whatsThis">
       <string>Oops! We don't seem to have any stream statistics for the requested port(s)
 

client/xtableview.h

@@ -169,7 +169,8 @@ public slots:
             for (int i = start; i < end; i++)
                 if (indexes.contains(model()->index(indexes.first().row(), i)))
                     text.append(model()->headerData(i, Qt::Horizontal)
-                                            .toString()+"\t");;
+                                            .toString().replace('\n', ' ')
+                                        +"\t");;
             text.append("\n");
         }