evolve: registed configitems if available
The config are registered as 'dynamicdefault' because we still need to
explicitly pass the config option for older version of Mercurial. (4.2 and
before).
syntax: re
/figures/[^/]+\.png$
^html/
\.pyc$
~$
\.swp$
\.orig$
\.rej$
\.err$
^tests/easy_run.sh$
^build/
^dist/
^MANIFEST$
^docs/tutorials/.*\.rst$
\.ico$
tests/\.testtimes