Final content for 1806 release

See merge request Community/catalyst!4

Improvements to cmake configuration

See merge request Community/catalyst!3

- the build is now much more strongly oriented on cmake.

  The wmake wrapper only adds some minor versioning on the build
  and uses a standard CMAKE_INSTALL_PREFIX to define its installation
  location.

  These changes can make it easier for some packagers (eg, spack)
  to manage.

 - LIBRARY_OUTPUT_PATH is removed
 - CMAKE_LIBRARY_OUTPUT_DIRECTORY is used instead of LIBRARY_OUTPUT_PATH
 - CMAKE_INSTALL_PREFIX is used as install destination

STYLE: minor formatting for cmake files

DOC: fixed emails in README

See merge request Community/catalyst!2

- split off boilerplate OpenFOAM settings as CMakeLists-OpenFOAM.txt

DOC: lowercase names for email addresses (request !2)

- allows restriction of the output patches to specific names and hiding
  others.

- forces release of memory for the associated backends

- log which channels are being emitted.
  The printChannels pipeline was redundant anyhow.

- removed fvMesh sub-channels if favour of selector flags.
  To enable/disable portions of the geometry:

      internal    true/false
      boundary    true/false

  This replaces the previous method of sub-channels in which restrictions
  were propagated from the pipeline through.

  Before
  ======
      Function Object:

          input
          {
              fields    (U p);
          }

      Pipeline:
          input = coprocessor.CreateProducer(datadescription, 'input/patches')

  Now
  ===
      Function Object:

          input
          {
              internal  false;
              fields    (U p);
          }

      Pipeline:
          input = coprocessor.CreateProducer(datadescription, 'input')

- allows cmake override of the default output library directory,
  which is normally $FOAM_LIBBIN

ENH: additional debug verbosity

- extra information (in parallel) when debug level > 1, which can help
  when isolating problems.

- if sigFpe is enabled within OpenFOAM, any errors in the Catalyst
  pipeline will potentially kill the entire simulation.

- use the new sigFpe::ignore helper class to manage a local disabling
  of SIGFPE handling.

- relocate to controlDict, since more than a single function object
  is often used.

- can remove directly from the temporary objectRegistry prior to
  converting by field type. Cannot, however, do the same for volFields
  or areaFields since these reside on their respective mesh objects.

- LINK_LIBRARIES are required for proper try_compile

STYLE: report output directory

- ParaView Catalyst with MPI is advisable (especially for larger
  simulations), but not a requirement

BUG: general patch movement was inconsistent

Feature unified output

Closes #3 and #4

See merge request Community/catalyst!1

- previously had separate function objects for each category of source
  (finite volume, finite area, lagrangian). This lead to isolation of
  the individual input sources, which highly restricted the flexibility.

- now have a single catalyst function object with an arbitrary number
  of inputs (sources). The catalyst channel name is that of the
  corresponds dictionary name. For volume mesh sources, it is possible
  to address "mesh" and "patches" sub-channels.

  Eg,
      mesh = coprocessor.CreateProducer(datadescription, 'myregion/mesh')

  This restructuring also aims at integration of other OpenFOAM content
  (eg, surfMesh, sampled probes, sampled surfaces) as a future
  development.

- the output directory (by default "<case>/insitu") is passed onto
  catalyst as its working directory, using the upstream patches that
  now close issue #4

- reflects current change being made to the vtkCPProcessor API to
  include chdir capabilities.

- prevents accidental overwrite of runtime conversions.

- uses the cellCellStencil information to blank holes and the
  interpolated cells.

- needs more detailed attention for handling cases when three or more
  meshes are overlapping.

- this is a convenient means of creating an output directory from within
  the function object without corresponding python or shell script.

  Some pipelines (image generation) balk if the output directory does
  not exist. Others (vtm writer etc) will create their own.

STYLE: use OpenFOAM caseDicts config files, newer string expansion.

- Eg, "<system>/scripts" instead of "$FOAM_CASE/system/scripts"

- OpenFOAM CleanFunctions now include removal of the 'insitu' directory

- Note that stopping the catalyst function object via a `timeEnd` value
  does not actually call the corresponding end() method.

  See: Development/OpenFOAM-plus#791

- note that the timeEnd keyword does stop the execution of the
  function object, but does not close the connection or free up
  resources

- restructured/renamed the various cfg files in anticipation of
  relocating them to the main OpenFOAM etc/caseDicts directory in the
  future.

- was check(), now query()

- emit/suppress information output based on 'log' setting
  (as per other functionObjects)

This integration represents a collective work
  - CINECA (Simone.Bna@cineca.it)
  - OpenCFD
  - with additional input from KitWare (Andy.Bauer@kitware.com)

NB: requires ParaView or ParaView Catalyst with MPI and Python