[CoinMp] memory leak problem with COINMP

[ming lu]

> Hi All,
>
> It looks that CoinUnloadProblem doesn't release resource correctly.
> The cbc was not released, this causes a huge memory leak problem. Also
> following members are not explicitly released:
>
>                                ClpSolve *clp_presolve;
>                                OsiClpSolverInterface *osi;
>                                CBMessageHandler *msghandler;
>                                CBIterHandler *iterhandler;
>                                CBNodeHandler *nodehandler;
>
>                                CglProbing *probing;
>                                CglGomory *gomory;
>                                CglKnapsackCover *knapsack;
>                                CglOddHole *oddhole;
>                                CglClique *clique;
>                                CglLiftAndProject *liftpro;
>                                CglSimpleRounding *rounding;
>
> Could someone take a look?
>
> Thanks,
> Ming
>