added support for ctrl-l and clear command into redis-cli. To clear the screen is a good idea from time to time :). Also linenoise updated to the current version to support this new feature.

quick and dirty fix for hiredis bug creating problem with the new redis-cli connect commmand. Also change prompt when redis-cli is not connected

Now the rdbSave* functions return the number of bytes written (or
required to write) in serializing a Redis object, writing to /dev/null
and using ftell (which doesn't work on FreeBSD) isn't needed anymore.

updated via commands.json in redis-doc repo. Currently
use `make src/help.h` to re-generate. The following
are valid from the REPL:

  help
  help [command]
  help [group]
  help groups

ex:

  help sort
  help hash

volatile-lru maxmemory policy segfault fixed, thanks to Anthony Lauzon for reporting the problem with the patch. Original patch modified a bit in order to avoid the double lookup if the policy is allkeys-lru

added noeviction policy to redis maxmemory. ZSCORE removed from the list of commands that can't be called when we are low on memory, this command was added in the past for a stupid error.

build redis-server at the end so have a more pleasing to see Make output and the advice to run the test suite at the end.

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

Now it is possible to use quoted strings in the redis.conf file accordingly to the sdssplitargs() function capabilities.