IMAPPush: Remove an extra .split() by altering the pnick/email regex.

Signed-off-by: Martin Stone <martin@d7415.co.uk>
!broadcast: Send to all (non-galchan) channels in the DB, not just those in merlin.cfg.

Signed-off-by: Martin Stone <martin@d7415.co.uk>
!defcall: Added "globaldef" config option to broadcast notices to all channels.

Signed-off-by: Martin Stone <martin@d7415.co.uk>
IMAPPush: Added "singleaddr" config option for using a single gmail account (rather than a whole domain) for PA notifications. Use account+pnick@gmail.com in PA Prefs page.

Signed-off-by: Martin Stone <martin@d7415.co.uk>