refineMesh: Improved command-line argument handling to be more consistent with other OpenFOAM utilities

    Command-line option handling:
    + If -all specified or no refineMeshDict exists or, refine all cells
    + If -dict <file> specified refine according to <file>
    + If refineMeshDict exists refine according to refineMeshDict

    When the refinement or all cells is selected apply 3D refinement for 3D
    cases and 2D refinement for 2D cases.