Docs: changes in PHP format
Fix bug with nested RCS.

In case there is more than one RCS that can handle a given file, for
example a git repo, and inside it mercurial repo, and inside the file to
be committed, then choose the closest one to to the file (shortest
relative path).

Closes bug 2062
Sort by path length

Might be safer and/or clearer.
Fix for bug 1979 (new round)

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