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

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