* sending NICK after 433 -- but before 001 from server -- does not
result in a confirmation NICK message back from server, so we need
to change Conn.Me.Nick in the 433 handler in this case.
* Nick MODE changes are transmitted back to us in line.Text not
line.Args[1], so make sure error messages use this when needed.
Send a single WHO on joining channel rather than triggering a WHOIS of
every nick in the 353 RPL_NAMES handler. Avoids 'Excess Flood' when
joining a large channel ;-)