"stack test" passed.

The Output "o" is passed down the call stack via
"buildLater" and will eventually be added to the
Network nOutputs ordered bag. It is created here
because we need to return a function that removes it
from the bag, but the result cannot be passed back to
us from the future.

In accordance with Cabal warning message.

reactimate1 and reactimate1' are not yet tested.

The reactimate cancel function calls runStep, which modifies an MVar
containing the network state. If this occurs while processing another
step (typically from within "execute") then the program will lock up
as the re-entrant call tries to read the MVar which is already being
modified.

Comments on pull resuest Cancelling reactimates HeinrichApfelmus#199

Changed type and name for reactimate_ and reactimate_'

Introduced new functions runMomentIO_ and getEventNetwork