clean REDIS_DIRTY_CAS when discard Command runs. otherwise the next MULTI/EXEC may fail in the same RedisClient 

new counter in INFO output: rejected_connections with number of dropped connections because of maxclients limit reached.

Fixed a typo in comments.

Fixed command table for SETEX and PSETEX causing the expire time to be hashed by Redis cluster instead of the key.

code generating the CLIENT LIST output refactored to have a function that is able to render a single client into a client info string.

Fix some minor typos.

New script timeout semantics and SCRIPT KILL implemented. SHUTDOWN NOSAVE and SHUTDOWN SAVE implemented.

Fix crash on SPARC due to improper alignment of allocated memory

I believe that you should be able to drop 'defined(__sun)' completely
from this clause, as Solaris on x86 hardware probably does not have
strict alignment requirements, but I don't have a way to test that.

Thanks to Jurij Smakov <jurij@wooyd.org>.
Signed-off-by: NChris Lamb <lamby@debian.org>

valgrind handles floating point numbers differently for some reason, so using "simpler" numbers to make tests happy.

Add separate clean/distclean targets to Makefile

To do so, the Makefile stores the contents of the MALLOC environment
variable in a file named .make-malloc. When the contents of this file
and the MALLOC variable are not equal, it forces a rebuild of the Redis
source tree.

A side-effect of this change is that choosing an allocator can now be
done using the single MALLOC variable instead of USE_TCMALLOC,
USE_JEMALLOC and so forth. These variables continue to work for
backwards compatibility.

This change moves the build instructions for dependencies to a separate
Makefile in deps/. The ARCH environment variable is stored in a
.make-arch file in the same directory as the Makefile. The contents of
this file is read and compared to the current ARCH, and, on a mismatch
triggers rebuilding the entire source tree.

When file .make-arch exists and matches with ARCH from the environment,
the dependencies are assumed to already be built.

The new "clean" target only cleans the Redis source tree, not its
dependencies. To clear the dependencies as well, the "distclean" target
can be used.

Fixing inject: it was failing when there was 1 or >2 sources