Hermax MaxSAT modeling library

[IgnaceBleukx]

Interface to the HerMax MaxSAT library.

Supports CP-level constraints, so does not require linearize/int2bool.

Two open issues:

1. __eq__ between two variables with disjoint domains raises a ValueError (see failing test). @josalhor I think it might be more natural to either return an empty clause instead, or return a specialized "trivial unsat" error or something. Then we can catch it at the CPMpy level and convert it to BoolVal(False) instead. I don' dare to catch ValueErrors as they can mean lots of things : )
2. Time limits are not supported as far as I can tell; I can of course interrupt the process with a Python Timer (as we do in PySAT), but HerMax does not provide a feasible solution in that case

[josalhor]

Hello :D

eq between two variables with disjoint domains raises a ValueError (see failing test).

I think you mean between a variable and a constant, is that correct?
Also, I see no failing test (?)

Time limits are not supported as far as I can tell; I can of course interrupt the process with a Python Timer (as we do in PySAT), but HerMax does not provide a feasible solution in that case

After talking with other people in the community I think I know how to support this.
Would you be interested only in optimal solutions with time limit setting or also suboptimals?

I will do a review of the integration soon