trying to use istl matrix instead of spmatrix. this means during solving this...

trying to use istl matrix instead of spmatrix. this means during solving this matrix has to be changed to spmatrix so that this can again convert to supermatrix inorder to use superLU solver..:( does nt sound very nice but cant find any other solution at the moment. it would be great to have a solver which use istl matrix and that can solve saddle point system like stokes

[[Imported from SVN: r4210]]