Make sendto rosters connection-based
On end-of-burst, add servers to R_SERVERS
Add excluded argument to u_roster_f
Propagate EUID, announce EUID for new users
Redo logging a bit
Move PRIVMSG and NOTICE to c_message.c.

These are going to get very large!
Use a sightly less dumb time format
Add u_entity, to make dealing with users and servers easier
Add %E format for entities
Whoops, fix vsnf logic for %E
Allow %E parameter to be NULL
Populate msg->src, containing src of message