API call interaction with Petri Net processes

Current releases are focussed on Erlang. The code generated for C is already believed to be correct.

This code is working. At least, inasfar as covered by the test directory, which means to start a process with start/3 or start_link/3 with the generic trans_noreply/4 backend, and then bother the Petri Net with event/3, marking/1 and both canfire/1 and canfire/2. The tests involve various traces through a simple Petri Net for a traffic light with night mode, and a complex Kerberos/DNS/DANE/ECDHE security process to be used for Kerberos Realm Crossover, including cached old rejections and successes, as well as refreshing of the latter when they are re-requested.

The following releases are planned to arrive at complete functionality:

• 0.8 will add working reflow procedures, and have them tested.
• 0.9 will test integration with application logic, application data, event data, return values.
• 1.0 will cleanup documentation and code, strive for good test coverage, and integrate with CMake.