make ratpoison -c provide a useful exit status

* properly define the way the wm may give feedback to ratpoison -c;
  see communications.c:receive_command_result()
* follow this protocol in events.c:receive_command()
* modify receive_command_result() to return an int (which is the
  mirror of the struct cmdret "success" member used on the wm side)
* pass that error status back to main.c; exit with an error status if
  any of the commands we sent failed

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