git-gui 0.18.0

* tag 'gitgui-0.18.0' of git://repo.or.cz/git-gui:
  git-gui 0.18
  git-gui: avoid an error message when removing the last remote
  git-gui: fix file name handling with non-empty prefix
  git-gui: bring wish process to front on Mac
  git-gui: change dialog button positions for Windows to suit platform.
  git-gui: allow "\ No newline at end of file" for linewise staging
  git-gui: fix the mergetool launcher for the Beyond Compare tool.
  Makefile: replace "echo 1>..." with "echo >..."
  French translation: copy -> copie.
  git-gui: Fix parsing of <rev> <path-which-not-present-in-worktree>