[Coin-lpsolver] Packed Matrix to CbcModel

[Lou Hafer]

Kyle,

	I can speak to the assignSolver question; I'll let John tackle the
assignProblem issue (the answer may well be specific to clp).

	You need to up cast your OsiClpSolverInterface to OsiSolverInterface.
This should be pretty straightforward --- either use a dynamic_cast, or assign
your OsiClpSolverInterface* to a variable of type OsiSolverInterface*.

							Lou