[broken schema] fix the group_mapping function in case where some standard group isn't found: we currently loop for ever, boring the user by asking ever and ever the same question...
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')