Added preliminary version of the rhoSimplecFoam code and tutorial case.

applications/solvers/compressible/rhoSimpleFoam/pEqn.H

applications/solvers/compressible/rhoSimplecFoam/Make/files

...ications/solvers/compressible/rhoSimplecFoam/Make/options

applications/solvers/compressible/rhoSimplecFoam/UEqn.H

...ations/solvers/compressible/rhoSimplecFoam/createFields.H

applications/solvers/compressible/rhoSimplecFoam/hEqn.H

applications/solvers/compressible/rhoSimplecFoam/pEqn.H

...ions/solvers/compressible/rhoSimplecFoam/rhoSimplecFoam.C

tutorials/compressible/rhoSimplecFoam/squareBend/0/T

tutorials/compressible/rhoSimplecFoam/squareBend/0/U

tutorials/compressible/rhoSimplecFoam/squareBend/0/alphat

tutorials/compressible/rhoSimplecFoam/squareBend/0/epsilon

tutorials/compressible/rhoSimplecFoam/squareBend/0/k

tutorials/compressible/rhoSimplecFoam/squareBend/0/mut

tutorials/compressible/rhoSimplecFoam/squareBend/0/p

...ressible/rhoSimplecFoam/squareBend/constant/RASProperties

...rhoSimplecFoam/squareBend/constant/polyMesh/blockMeshDict

...ible/rhoSimplecFoam/squareBend/constant/polyMesh/boundary

...oSimplecFoam/squareBend/constant/thermophysicalProperties

...e/rhoSimplecFoam/squareBend/constant/turbulenceProperties