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- this eliminates a degree of ambiguity when resolving a read() method
  in inherited classes.

- ignore implicit-fallthrough for ragel generated code.

- add -Wno-deprecated-declarations for c++LESSWARN.
  These principally associated with older CGAL versions and their use
  of particular mpfr routines.

- simplifies conversion of RPM to radians/sec for const variables

- improve doxygen for lumpedPointMotion

- ref issue #762

STYLE: consistency in file vs files for pointNoise and surfaceNoise

- use "files" when available, fallback to "file" otherwise.

Some special adjustments are undertaken for distance = 0.

- With the isoSurfaceCell algorithm is used, additional checks for open
  surfaces edges are used to limit the extend of resulting distance
  surface. The resulting surface elements will not, however, contain
  partial cell coverage.

- Always treated as signed (ignoring the input value), since it is
  nearly impossible to generate any surface otherwise.

- missing indexing caused the real radius to be largely ignored
  when useRealRadius = true

- the original intention was to avoid vtp output when the clouds are
  empty anyhow. However, it is useful for post-processing to have
  clouds with zero parcels (eg, before the start of injection).

  Pruning of empty clouds is now an option in the vtkCloud dictionary
  controls, with the default being false (no pruning). This represents
  a non-breaking change in behaviour since it generates more output
  than previously.

  Example,
  {
      type    vtkCloud;
      //- Suppress writing of empty clouds (default: false)
      prune   true;
  }

- use "min:xxx" format for AMIInterpolation as well

Merge branch 'develop-pre-release' of develop.openfoam.com:Development/OpenFOAM-plus into develop-pre-release

- the backend script should not be accessible from the PATH.
  Using deprecated/ adds a level of documentation.

- functionObjectLibs -> libs
- redirectType -> name
- change deprecated writeCompression flags types to Switch.

- cleanup some trailing ';;' from some dictionaries

STYLE: separate areaNormal/unitNormal method for primitives (issue #885)

See merge request OpenFOAM-plus!208