mutex only log up to 5 messages (spread over the configured total amount
of time), if memcache is down don't retry in other connections for up to
30 seconds (configurable), removed TCP_NODELAY and NO_BLOCK options,
memcache servers are setup in a single string, renamed ReInitSharedMem()
to ReInitIPC(), fixed comments and public/private/protected visibility,
fixed upper/lowercasing of method names, added some dots.

Released under the Affero GNU General Public License (AGPL) version 3.