Supervisor modes

I changed operations so that it can be applied to replicated nodes, including bind, read, next, wait_needed, is_det, declare. There are still two operations 'fetch'  and 'reply_fetch' to be done. They are used to fetch values when a dataflow variable is bound to another.
Rather than put 3 everywhere, why not change N to 3, move it to the include file and use ?N.  Super confusing having ?N be 1 and everything operate over 3.