updated cfdemSolverRhoPimple requires pMin/pMax or pMinFactor/pMaxFactor
for pressure control (OF >= 5) instead of rhoMin/rhoMax (OF 4) for
density control
Since OpenFOAM-3.0 it is the convention to put blockMeshDict into system
instead of constant/polyMesh
Having blockMeshDict in system is supported since OpenFOAM-2.3