Merge git://repo.or.cz/git-gui

* git://repo.or.cz/git-gui: git-gui (Windows): Change wrapper to execdir 'libexec/git-core' git-gui (Windows): Switch to relative discovery of oguilib git-gui: Correct installation of library to be $prefix/share git-gui: Fix gitk search in $PATH to work on Windows git-gui: Preserve scroll position on reshow_diff. git-gui: Fix the Remote menu separator.