Ready Bit support. New field in the nodes table. Initialized by
handle_os. Two new TMCC commands. "ready" says the node is ready (sets ready to 1 in nodes table). "readycount" returns an N of M ready count to the caller. This is not a barrier sync operation! Nodes must poll, and there is no way to reset the count since that would require some sort of synchronization, which of course we do not have.