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- need to explicitly include vtkPVConfig.h to get the version macros

- use cellCentres() instead of volField equivalent for vtk conversion

- make looping variables more consistent

- use updated Foam::vtk::Tools

- use fieldTypes static information

- eg for foamVersion.H

Final content for 1806 release

See merge request !4

Improvements to cmake configuration

See merge request !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 !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 !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.