Fix for issue 516, rewriting the command vector to correctly repliate BRPOPLPUSH. Still to test everything, especially edge cases

removed assert causing an illegal memory access. This was responsible of crashes during BLPOP and other list blocking operations.

This reverts commit c138dc7d.
Moving all the new stuff in 2.4 branch.

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

BLPOP inside MULTI/EXEC block no longer crashes, instead if the list is empty the behavior is like if the timeout is reached. This fixes Issue 285

networking related stuff moved into networking.c

moved more code

more work on layout of source code

SDS instantaneuos memory saving. By Pieter and Salvatore at VMware ;)

cleanly compiling again after the first split, now splitting it in more C files

moving more things around... work in progress

split replication code

splitting more

Sets split

Hash split

replication split

even more splitting

more splitting

minor change