Reintroduce duniter-prover in duniter core code
If it is possible, I would prefer to embed this code directly in duniter core, like it was the case in previous versions.
It was put into an external package for refactoring purposes, but now it is OK to put it again in the main code, well separated from the rest of the code. It would be put as a module, in the
See #1021 (closed).