Fix lexically_relative return when base path evaluates to *this #179
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gulrak
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Fix the return of lexally_relative when called with the following values:
"/a/b/c".lexally_relative("/a/b/c/d/..") == "."
The proposed change is based on the following line from the documentation:
"otherwise, if N = 0 and a == end() || a->empty(), returns path("."), "