Added a configuration directive to allow a user to specify the
permissions to be granted to the Unix socket file.  I followed
the format Pieter and Salvatore discusses in issue #85 (
https://github.com/antirez/redis/issues/85).

Fixed command table for RESTORE to make it accepting keys only for the right slots when cluster is enabled.

Applied patch from Issue 119 provided by 
pahowes@gmail.com

Auto rewrite integer overflow fixed. Thanks to Gaurav for finding it (see issue 602 on google code), and Pieter Noordhuis for tracing it.

prepareForShutdown() fixed for correctness regarding what to do with AOF and RDB persistence on exit.

Take a pointer to the relevant entry of the command table in the client structure. This is generally a more sounding design, simplifies a few functions prototype, and as a side effect fixes a bug related to the conversion of EXPIRE -1 to DEL: before of this fix Redis tried to convert it into an EXPIREAT in the AOF code, regardless of our rewrite of the command.

childrens -> children in INFO output field names. This is a backward incompatible change, but really a minimal one.

Slight adjustment in growth calculation.

INFO now contains the time (in usecs) needed to fork() in order to persist. The info is available in the stats section of INFO.