- this change was wished by Mattijs and/or Henry

- allow command-line settings to retain the flexibility of 'foamPV'
  alias mechanism.

This reverts commit 2e1e671d.

- platforms/WM_OPTIONS/lib
      old: lib/WM_OPTIONS

- platforms/WM_OPTIONS/bin
      old: bin/WM_OPTIONS
      old: applications/bin/WM_OPTIONS

A runtime environment nows needs
    - bin/
    - etc/
    - platforms/

- drop FOAM_MPI_LIBBIN variable in favour of FOAM_MPI from which
  two different locations can be determined.

  Previously there was something like this:

      FOAM_MPI_LIBBIN = $FOAM_LIBBIN/openmpi-1.5.1

  We now instead determine the locations from the FOAM_MPI directly:

      FOAM_MPI=openmpi-1.5.1

          $FOAM_LIBBIN/$FOAM_MPI     -> OpenFOAM  mpi-related
          $FOAM_EXT_LIBBIN/$FOAM_MPI -> ThirdPary mpi-related

ENH: relocate ParaView libraries and plugins back under FOAM_LIBBIN

- as discussed with Mattijs

- remove settings for really old cmake versions

- place under $WM_THIRD_PARTY_DIR/lib/$WM_OPTIONS
- relocate FOAM_MPI_LIBBIN accordingly

- avoid non-standard 'tempfile' in bin/tools/foamConfigurePaths

- consistent and shorter naming throughout

- simplifies syncing compiled versions.
  For a runtime environment, only need these directories:
      bin/
      etc/
      lib/

- more obvious in its meaning

- eg, "foamNewSource IO -", "foamNew -s IO -"  displays on stdout
  convenient for grabbing boilerplate directly