This is a simple wrapper around `git cherry-pick -x`. It has two
features which I find useful.
1. It will automatically scan the origin branch (anon/main by default)
to look for missing Fixes commits, and will cherry-pick those as well.
For instance, if I MFC commit
895a0ae67fe2c0c45b68991f1bba0c62f4d00ad5, `git-mfc` will
automatically MFC commit c564074c9aaa8a3f9273de3cb802edcb3e2e2a40 as
well.
2. It has a `--dangling` option which scans the whole branch (up to the
merge parent) looking for MFCed commits that have fixup commits in
the origin branch which were not MFCed.