remove wild debug statement.
Do not consider files outside the source tree.
v0.4.4 - can skip with 's'.
v0.4.3 (README++)
improve diff highlighting.
remove the use of git
v0.4.1 - typofix!
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'.