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- allows reuse for other purposes

- improved move constructors/assignments for fileName, string, etc

- instead of   dict.lookup(name) >> val;
  can use      dict.readEntry(name, val);

  for checking of input token sizes.
  This helps catch certain types of input errors:

  {

      key1 ;                // <- Missing value
      key2 1234             // <- Missing ';' terminator
      key3 val;
  }

STYLE: readIfPresent() instead of 'if found ...' in a few more places.

- the opposite problem from issue #762. Now we also test if the input
  token stream had any tokens at all.

- called by the dictionary get<> and readEntry() methods.

for correct run time reading.
Setting up twoSimpleRotors tutorial for smooth pressure
fluctuations

- simply combines (rootPath()/globalCaseName())

This fix changes how the intersections loop ignores previously
intersected faces. It now marks them by their index so that subsequent
iterations ignore them.

Before this change, after an intersection was found the start point was
advanced by a small amount to move the past the intersection. The
problem with this was if multiple boundary faces or the end point were
in close proximity to the intersection then the move forward might span
them. This could lead to intersections being missed or counted multiple
times, in some cases indefinitely.

Based on a patch contributed by Mattijs Janssens
Resolves bug report https://bugs.openfoam.org/view.php?id=1147

Merge branch 'wp3-directional-refinement' of develop.openfoam.com:/Customer-VWG/OpenFOAM-plus into wp3-directional-refinement

ENH: fieldMinMax function object - updated for case where there are no cells on a local processor, e.g. CHT

- Can now retrieve or set a column/row of a tensor.
  Either compile-time or run-time checks.

  Get
     t.col<1>();   t.col(1);
     t.row<1>();   t.row(1);

  Set
     t.col<1>(vec);   t.col(1,vec);
     t.row<1>(vec);   t.row(1,vec);

  The templated versions are compile-time checked

     t.col<3>();
     t.col<3>(vec);

  The parameter versions are run-time checked

     t.col(3);
     t.col(3,vec);

ENH: provide named access to tensor/tensor inner product as inner()

Helper function to calculate the current face area vs the area returned
from the current point locations.  Useful for ACMI-type baffles where we
scale the face areas without moving points.

- nBoundaryFaces() is often used and is identical to
  (nFaces() - nInternalFaces()).

- forward the mesh nInternalFaces() and nBoundaryFaces() to
  polyBoundaryMesh as nFaces() and start() respectively,
  for use when operating on a polyBoundaryMesh.

STYLE:

- use identity() function with starting offset when creating boundary maps.

     labelList map
     (
         identity(mesh.nBoundaryFaces(), mesh.nInternalFaces())
     );

  vs.

     labelList map(mesh.nBoundaryFaces());
     forAll(map, i)
     {
         map[i] = mesh.nInternalFaces() + i;
     }

chtMultiRegionSimpleFoam

Previously had 3 possibilities for handling exposed internal faces

  1. use default "oldInternalFaces"
  2. specify -patch, to use the specified (existing) patch
  3. specify -patches, to use the geometrically closest patches

Now relaxed the restriction on -patch to allow specification of a new
(not yet existing) patch name. This improves flexibility, but won't
catch typing mistakes.

Harmonize behaviour of -patches and -patch. When -patches is used to
specify a single, non-regex patch name, it now behaves identically to
-patch. Since the getList handling for options already allows special
treatment for single parameter lists, the following will work
identically:

      subsetMesh -patch  patch0
      subsetMesh -patches patch0
      subsetMesh -patches '( patch0 )'

In the future it might be reasonable to fully combine the behaviour of
'-patch' and '-patches' and treat them as aliases for each other.

ENH: support subsetMesh on a cellZone.

- when the '-zone' option is specified, the command argument is treated
  as the name (or names) of cellZones to be selected instead of as the
  name of the cellSet.

  The command argument can be a single word, regex, or list of
  word/regex.
  Eg,

      subsetMesh -zone -patch mypatch  mixer
      subsetMesh -zone -patch mypatch  '(mixer "moving.*" )'

STYLE: simplify set handling and other code cleanup in subsetMesh