Merge branch 'pw/unquote-path-in-git-pm' into maint

Code refactoring.

* pw/unquote-path-in-git-pm:
t9700: add tests for Git::unquote_path()
Git::unquote_path(): throw an exception on bad path
Git::unquote_path(): handle '\a'
add -i: move unquote_path() to Git.pm

diff --cc git-add--interactive.perl
Simple merge