* 'master' of git://repo.or.cz/git-gui:
git-gui: Change base version to 0.6.
git-gui: Guess our version accurately as a subproject.
git-gui: Handle gitgui tags in version gen.
git-gui: Generate a version file on demand.
git-gui: Rename GIT_VERSION to GITGUI_VERSION.
git-gui: Allow gitexecdir, INSTALL to be set by the caller.
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