Correctly glue the reply buffer. For now returned as it is to Lua, but will be converted into Lua native type later.

Lua call of Redis command work in progress: sorry I have to go to the cinema to watch the Source Code movie

when Redis fails accepting a new connection reports the error at WARNING and not VERBOSE error level. Thanks to offby1 for proposing this in the Redis mailing list. #backport-candidate

Fixed a bug with replication where SLAVEOF NO ONE caused a slave to close the connection with its slaves

removed check for zmalloc return NULL in createClient(). The check was misplaced, and zmalloc never returns NULL.

fixed memory leak introduced with the previous commit. Many thanks to Pieter Noordhuis for spotting it in no time

Fixed issue #503. MONITOR + QUIT could crash the server, there are actually other interactions that could have the same effect (for instance Pub/Sub).

Fixed issue #435 and at the same time introduced explicit ping in the master-slave channel that will detect a blocked master or a broken even if apparently connected TCP link.

implemented a different approach to IO scheduling, so object->storage is no longer used, instead there is a queue and hash table of IO tasks to process, and it is always possible to know what are the scheduled and acrtive IO operations against every single key.

LRANGE converted into a COW friendly command. Some refactoring, comment, and new addReply*() family function added in the process.

first attempt to non blocking implementation of slave replication and SYNC bulk data download. Never compiled so far...

modified a bit addReply() to play better with copy on write now that we have a static buffer. Changed the name of a function from _ensureFileEvent() to _installWriteEvent().

When creating the readable event results in an error (this happens when
the server hits OS limits), the client was not added to the list of
clients when freeClient was called. This results in an assertion error.
It is better to check this condition first and free the client
immediately when this condition occurs. Port of 00a90feb.