Merge branch 'ps/contrib-sweep'

Remove bunch of stuff from contrib/ hierarchy. * ps/contrib-sweep: contrib: remove some scripts in "stats" directory contrib: remove "git-new-workdir" contrib: remove "emacs" directory contrib: remove "git-resurrect.sh" contrib: remove "persistent-https" remote helper contrib: remove "mw-to-git" contrib: remove "hooks" directory contrib: remove "thunderbird-patch-inline" contrib: remove remote-helper stubs contrib: remove "examples" directory contrib: remove "remotes2config.sh"