* Check and restore .git/MERGE_HEAD if it exists
* Check that current branch is not (no branch)
* "amend" screws with the reset stuff
Check Makefile vs Makefile.PL modification times for re-run.
Also tidy up on renames, as they show up only as renames even if the
file got modified as well.
* Detect modified .perltidyrc or .podtidy-opts files and error out