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

* git://repo.or.cz/git-gui: git-gui: Fix the search bar destruction handler. Update the po template git-gui: Implement automatic rescan after Tool execution. git-gui: Allow Tools request arguments from the user. git-gui: Add a Tools menu for arbitrary commands. git-gui: Fix the after callback execution in rescan. git-gui: Implement system-wide configuration handling. git-gui: try to provide a window icon under X