Implemented anvil service, which is used to implement mail_max_userip_connections. --HG-- branch : HEAD

master: Fixes to handling logging. Master now has a non-blocking write pipe to log process, so it no longer blocks if log process is hanging. Also it's cleaner to send log commands via a pipe specifically meant for them. --HG-- branch : HEAD

Initial commit for v2.0 master rewrite. Several features are still missing. --HG-- branch : HEAD