Parallel computing proof of concept

Make an example parallel computing app, in order to debug our technology and to provide a basis for real apps.

This would have two parts:

* The worker (a sporadic app, using libp2p, with an API to hide the complexity.  Linux/C++; use BUDA.
* A server-side coordinator.  Needs to be able to handle ~1M workers.  Do it as a web script using a DB?