effectflag: activate effect flag for obsmarkers-case-*.t test files Prepare activation of effect flag by default by activating it on test- exchange-obsmarkers-case-*.t test file first.

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