ENH: Building OpenFOAM sub-packages (issue #8579) (#8592)

* ENH: Building OpenFOAM sub-packages (issue #8579)

* Some support for packages building with OpenFOAM

- Adjust the wrappers calling the OpenFOAM Allwmake script. Have them
  look for a Allwmake-spack file first, which is assumed to contain
  special adjustments for compiling with spack.

  This file could be delivered as part of a tarball (which is unlikely)
  or generated on the fly by the spack sub-package as part of its
  patch or configure stage.

CONFIG: change the default paraview variant for openfoam to be False

- the different combinations of paraview backends, off-screen etc
  make it difficult to suggest that building with paraview as
  a standard dependency makes much sense.
  Additionally, building paraview with qt can become quite an issue.
  So it makes much more sense to only enable that upon request.

ENH: add a +vtk variant.

- for VTK with off-screen rendering to be used by the runTimePostProcessing
  function object, which is a fairly simple framework for generating images of
  some OpenFOAM derived objects (eg, sampling planes).

SPACK spec problem:

- reflect the flex restriction impose by the scotch dependency within
  the openfoam spec as well, as partial workaround for buggy or annoying
  spec resolution.

OTHER:

- updated the backstop foamEtcFile file to include args handling
  as per the OpenFOAM-v1806 updates.

* new version: OpenFOAM-v1806

- https://www.openfoam.com/releases/openfoam-v1806/

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