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

* git://repo.or.cz/git-gui:
  git-gui: Implement "Stage/Unstage Line"
  git-gui: Don't select the wrong file if the last listed file is staged.
  git-gui: Fix accidental staged state toggle when clicking top pixel row
  git-gui: Move on to the next filename after staging/unstaging a change

diff --cc git-gui/git-gui.sh
Simple merge

diff --cc git-gui/lib/diff.tcl
Simple merge