effetflag: detect other meta (extra) changes Check other changeset meta other than branch and *_source and if there is a change, set the METACHANGED effect flag. Add a test for this scenario with a topic change.

syntax: re
/figures/[^/]+\.png$
^html/
\.pyc$
~$
\.swp$
\.orig$
\.rej$
\.err$
^tests/easy_run.sh$
^build/
^dist/
^MANIFEST$
^docs/tutorials/.*\.rst$
\.ico$
tests/\.testtimes