#1251878: Cubicweb no longer crash for missing instance and data dir at create.
Those directory should be created by cubicweb now.
We may want to issue a warning if they are missing.
option_group_changed('port', 'main', 'web')
option_group_changed('query-log-file', 'main', 'web')
option_group_changed('profile', 'main', 'web')
option_group_changed('max-post-length', 'main', 'web')