o TODO in commands (command.c and command_reply.c):
o RESTART is not implemented
- o CMODE should be rewritten as it uses a lot duplicated code.
- Some of the modes may still not be implemented or is implemented
- the wrong way.
o In servers all command reply funtions should still call the
pending command reply even if the reply was error. In client
it is not called but in server, I think, it must be called.