ENH: (further) Doxygen documentation updates for module support

applications/utilities/doc/utilities.dox

applications/utilities/doc/utilitiesDoc.H

applications/utilities/mesh/advanced/PDRMesh/PDRMesh.C

...ons/utilities/mesh/advanced/collapseEdges/collapseEdges.C

...ities/mesh/advanced/combinePatchFaces/combinePatchFaces.C

applications/utilities/mesh/advanced/modifyMesh/modifyMesh.C

...ons/utilities/mesh/advanced/refineHexMesh/refineHexMesh.C

...utilities/mesh/advanced/refineWallLayer/refineWallLayer.C

...utilities/mesh/advanced/refinementLevel/refinementLevel.C

...cations/utilities/mesh/advanced/removeFaces/removeFaces.C

...cations/utilities/mesh/advanced/selectCells/selectCells.C

...ilities/mesh/advanced/snappyRefineMesh/snappyRefineMesh.C

applications/utilities/mesh/advanced/splitCells/splitCells.C

...lities/mesh/conversion/Optional/ccm26ToFoam/ccm26ToFoam.C

...tions/utilities/mesh/conversion/ansysToFoam/ansysToFoam.L

...cations/utilities/mesh/conversion/cfx4ToFoam/cfx4ToFoam.C

applications/utilities/mesh/conversion/datToFoam/datToFoam.C

...s/mesh/conversion/fluent3DMeshToFoam/fluent3DMeshToFoam.L

...ities/mesh/conversion/fluentMeshToFoam/fluentMeshToFoam.L

...ities/mesh/conversion/foamMeshToFluent/foamMeshToFluent.C