Similar to /msg, inviting a user that is not in a channel
you have op or voice in requires a free target; opers always
have a free target.
Being invited adds the source as a reply target.
When a user receives a private message, notice or RPL_UMODEGMSG,
add the source to a special set of 5 target slots.
These slots are checked in the normal way when sending messages,
allowing a reply without using up a free target.
This feature will not be very useful if a user is being messaged
by many different users; to help this, messages blocked entirely
by +g or +R do not affect the targets. CTCP replies also remain
free in terms of targets.
The server protocol for this is
:<uid> ENCAP * CERTFP :<40 hex chars>
both in new user introductions and in burst.
As in oftc-hybrid, only the user themselves and opers can see the certfp.
Displaying the certfp on connect seems unnecessary to me,
the user can whois themselves if needed.
A notice will be sent to any force parted users that the channel
is temporarily/permanently unavailable on the server.
A new config option channel::resv_forcepart can be used to disable this.
from ircd-ratbox (dubkat)
Allowing this desynchronizes clients and servers that
do not know about this extension without good reason.
If you want to allow this, change it to spit out the
usual AWAY protocol.
A large group is any $$ or $# or a channel with more than
floodcount/2 local members, checked on each server separately.
Note that floodcount checks are done on the sender's server.
The special treatment is active for 15 seconds.
The change also applies to xlines sent to other servers.
Note that the backslash must be supplied in an unxline.
Incoming xlines containing '",' are rejected to avoid
inconsistency between servers.
Spaces in xline.conf files are changed to \s in memory
and recognized on unxline, but are not changed in the
file. New xlines are added to xline.conf files with \s.
xline.conf written by this commit or newer will not work
properly with charybdis older than 1124:131254925f32 (which
introduced \s support in match_esc()).
