v0.4.4 - can skip with 's'.
improve diff highlighting.
v0.4.0 - varia and cosmit
clean import, reduce log and better progress bar.
add tests file ex.py and test.py...
add 'mutation apply UID'.
do not show mutation during test, but during replay.
- Check the database exist.
- play_test_tests: pass extra argument `command` for replay...
- Specify numprocesses only when max workers > 1.
- During `play` store command for re-use in `replay`.
- Count mutation failures.
- replay: re-use command.