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This reverts commit 54f96deb.

Because this is a nightmare to manage

They are atomically unblocked in the ppoll/epoll_pwait calls, avoiding any
race condition on the check of the “stop” or “reload” booleans.

Some XMPP client ping themselves inside MUCs, to know if they are still in
there, this created a flood of PING message in private.  If the user is
interested in knowing when they receive a ping or version request, they can
still read their XML logs

fix #2472

ref #2472

ref #2472

Our CTCP notice didn't include a \01 char at the end.  We thus failed to
check the PING id when we received it ourself, because one char was missing

fix #2694

fix #3041

Instead of ignoring the stanza, we send back an error of type
remote-server-not-found each time it's possible.

Also avoid having to do if (!irc) return; everytime.

fix #3045

fix #3042

This way, the users can receive the result of any IRC command (although not
parsed nor formatted in anyway) when biboumi doesn’t support it

fix #2884

Messages received on an IRC server JID are forwarded as raw IRC messages.

fix #2486

This environment variable points to the location the user expects to
find every program’s config file, or if it isn’t set, ~/.config/biboumi
(with a fallback to . if $HOME isn’t set).

fix #2553

Note, in our context, is_connecting() includes the resolving part as well as
the actual connection (if we are using c-ares)

fix #3048

fix #3047

This reverts commit ad0465b3.

Conflicts:
	louloulibs

To avoid doing a double exit when receiving bot SIGINT and SIGTERM

This let users send message to nicks such as Q@CServe.quakenet.org

fix #3047

Only keep some biboumi-specific commands into biboumi_adhoc_commands.hpp/cpp