- log_errors option, true by default
- errors go in log_dir/errors.log (so $XDG_DATA_HOME/errors.log
by default)
This should help a lot for debugging, and provide a way for people
to easily give debug traces without useless or personal infos.
- Add an option enable_carbons (defaults to false)
- Make a disco on non-roster entites to determine if the message
commes from a muc private chat or not.