config: remove uses of obsolete._enabled Upstream Mercurial will be removing obsolete._enabled soon, so switch all our uses of it to use the new obsolete.isenabled(repo, option) function.

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