backport.pl: Teach it moving entries to the Approved section.
backport.pl: Teach it moving entries to the Approved section.

* tools/dist/backport.pl
  (usage): Document this feature.
  (handle_entry): Implement 'approved' UI.
  (main, exit_stage_left, warning_summary, vote): Percolate $approved.
  (vote): Print apprived entries at the very end of the edited
    file, tweak generated log messages.

git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1499739 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion