Added logging, improving solution and interrupt callbacks to C++ and C for a single user-defined callback method. Specifically
- New logging callback consistent with new callback method. Old logging callback is deprecated
- Callback when MIP logging takes place
- Callback when MIP solver finds an improving integer feasible solution
- Interrupt callbacks for simplex, interior point and MIP solvers
Added the use of the objective_target option to terminate the MIP solver when an integer feasible solution at least as good as this value has been found.
Bug fixes