- can specify 'CofR', 'coordinateSystem' or implicitly (0 0 0)
  which increases the flexibility

- 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.

This reverts commit b18f6cc1.

- 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

STYLE: report when SIGFPE handling is unsupported

- move OSspecific.H include from signal headers to argList where
  it is more obvious