contribution wanted
failing test for nn.Shutdown()
failing test for node.shutdown
node.shutdown test now passes, other tests still fail.  things a bit of a mess.
remove debug info
nn.Shutdown() now works, tests passes
in stochastic hill climber, shutdown networks after done with them
if node is shutdown, abort any scatterOutput attempts
add CTL_MSG_INBOUND_ADDED and related code.  many tests not currently passing.
rename to waitCanPropagate.  test passes now after adding sleep hack.
found the root of the problem and added some code to detect that situation and panic.
make node.Run() synchronous and spawn a go routine internally
Restore TestShutdown, and remove the sleep hacks
change returns to breaks
remove debug logging
Fix bug that was detected by TestCanPropagateSignalReAddConnection
add test that detects bug when re-adding connection to running node with no connections
Remove debug statements
comment regarding data race