- similar to autoPtr and unique_ptr. Returns the pointer value without
  any checks. This provides a simple way for use to use either
  an autoPtr or a tmp for local memory management without accidentally
  stealing the pointer.

  Eg,

     volVectorField* ptr;
     tmp<volVectorField> tempField;

     if (someField.valid())
     {
         ptr = someField.get();
     }
     else
     {
         tempField.reset(new volVectorField(....));
         ptr = tmpField.get();
     }

     const volVectorField& withField = *ptr;

STYLE: make more tmp methods noexcept

- in some cases this means you could avoid an isA<> followed by
  second dynamicCast<>

- makes the intent clearer and avoids the need for additional
  constructor casting. Eg,

      labelList(10, Zero)    vs.  labelList(10, 0)
      scalarField(10, Zero)  vs.  scalarField(10, scalar(0))
      vectorField(10, Zero)  vs.  vectorField(10, vector::zero)

- they had an isType<> instead of isA<>() check

    Averages columns of cells for layered meshes.

    For each patch face, calculates the average value of all cells attached in
    the patch face normal direction, and then pushes the average value back
    to all cells in the column.

    Useful for channel-like cases where we want to average fields in the
    spanwise direction.

    Example of function object specification:
    columnAverage1
    {
        type        columnAverage;
        libs        ("libfieldFunctionObjects.so");
        ...
        patches     (front side);
        fields      (U p);
    }

    Where the entries comprise:
    \table
        Property     | Description               | Required    | Default value
        type         | type name: fieldMinMax    | yes         |
        patches      | list of patches to collapse onto | yes  |
        fields       | list of fields to process | yes         |
    \endtable

- this corresponds to 'never match', which may be useful in combination
  with -constant selection.

  Eg,

      surfaceMeshTriangulate -constant -time none

  selects only the constant entry and suppresses any automatic time loop

STYLE: adjust help for the standard -times option

- indicate that times can be comma or space separated, since this is
  otherwise not apparent. Don't mention semicolon separators in the help
  since that just adds even more clutter.

- support .vtp format for geometry, surface, line, cloud.

- use native reader for handling vtk, vtp, obj, stl surface files.
  For other formats, use the MeshedSurface (the surfMesh lib) to
  handle reading and Foam::vtk::Tools::Patch to handle the
  conversion to vtkPolyData. This combination is more memory efficient.

- update tutorial case to include vtp surface geometry

- note that it does not actually triangulate unless necessary, should
  probably receive a new name.

- use newer constructs for handling processor/non-processor patch
  selection etc.