evolve: handle invalid obsmarkers in the `debugobsconvert` User can now recover from such situation, The error message is also changed to point the `debugobsconvert` commands.

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