(and tell what is failing)

- Try to reduce the use of the “core” object in the plugins
- New “api” member for each BasePlugin which is a wrapper around
    the unique PluginAPI object. (instead of having the methods
    directly in BasePlugin and then calling the PluginManager)
- Documented methods with rst (for sphinx)

(THE NAMESPACE WAS NOT PRESENT ANYMORE)

for consistency

(also move replace_key_with_bound() to core.py, to prevent having
common.py depending of config.py)

- Add the theming options COLOR_ROSTER_ERROR, CHAR_ROSTER_ERRROR, and
    CHAR_ROSTER_ASKED

(if python had real closures, I would not need that)

And fix some imprecisions/mistakes in the help.

fix a TB in the MUC
fix the completion (no quotes)
add a timeout of 5 seconds

- remove the help message for people still using the old custom
    sleekxmpp repo

- reload the config/theme with SIGUSR1
- quit properly with SIGHUP/SIGTERM

- Prevent correction of delayed messages
- Prevent correction of messages by someone else in a MUC (and in a
  private tab)
- Messages with unauthorized corrections (above) or wrong message id
  will be displayed as normal messages

TODO: restrict the corrections to the same fullJID (only in direct
"normal" conversations, because we can know in private an muc tabs, via
the User object)

(if the room was not joined)

(like in weechat)

(add a defaultdict to keep the folded state in each group)

M-d and M-c become M-D and M-C

when no message has been sent yet