solution_callback for Hexaly
#787
Open
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Hexaly has support for intermediate solution callbacks. Added the necessary code on CPMpy's side for the
solution_callbackargument of a.solve()call, similar to OR-Tools.Also very small fix for setting solver-native arguments,
setattr(self.hex_solver, arg, val)should have beensetattr(self.hex_solver.param, arg, val).