minimal change to obuf-limits.tcl test to make sure there are no false positives with 32bit instances as well.

Lua reports line numbers off by one in error messages

setKey(): call the higher level wrapper setModifiedKey() instead of touchWatchedKey() even if currently they are exactly the same.

SORT with STORE removes key if result is empty. This fixes issue #227.

Fixed a non critical bug signaled by clang static analyzer thanks to Mukund Sivaraman for reporting it: there was a not initialized field populating the cluster message header, but it is always fixed at later time before sending the packet.

patch by Mukund Sivaraman, modified by me to make it simpler and to use
my coding style).

Client output buffer limits: configuration of parameters for the different classes of clients implemented.

asyncCloseClientOnOutputBufferLimitReached() now ignores clients with REDIS_CLOSE_ASAP flag already set. Return value of the function changed from int to void since it is not used. Fixed logging of the client scheduled to be closed.

Implementation of the internals that make possible to terminate clients overcoming configured output buffer (soft and hard) limits.

fixed typo in hahs function seed default value. It is no longer used but fixed to retain the old constant as default anyway.

Fix for hash table collision attack. We simply randomize hash table initialization value at startup time.

all the stack trace related functions are now in debug.c. Now Redis dumps registers and stack content on crash. Currently osx supported, adding Linux right now.

Track the length of the client pending output buffers (still to transfer) in a new field in the client structure.