Author: Kev <klmitch@mit.edu>

Author: Kev <klmitch@mit.edu>
Log message:

	* ircd/channel.c: ok, now last mode rules; mode +ps will always
	result in +s (and won't send a mode if the channel is already +s);
	mode +sp will always result in +p; -n+n on a +n channel results in
	no mode change; -n+n on a -n channel results in a +n mode change;
	etc.

Status: stable; I don't expect there will be any more problems besides bugs

Testing done: Simple modes conform to the behavior I expect, i.e., last
  mode takes precedence.  No empty mode commands are forwarded to remote
  servers.  +p and +s are mutually exclusive.  No unset modes are removed.

Testing needed: Brute force check it and report any problems; I'm
  particularly concerned with BURSTs and server MODEs, though reports on
  OPMODE and user MODEs will also need to be considered.  It should work.

git-svn-id: file:///home/klmitch/undernet-ircu/undernet-ircu-svn/ircu2/trunk@299 c9e4aea6-c8fd-4c43-8297-357d70d61c8c