- naming similar to objectRegistry, with unambiguous resolution.
  The lookup() methods have different return types depending on the
  calling parameter.

STYLE: use IOobjectListTemplates.C for implementations

- previously included as local definition within IOobjectList.C,
  but will be adding more templated methods soon.

- adjust parameters (eg, matchName instead of matcher) to show their
  function

ENH: handle objectRegistry::names<void>(...)

- this is equivalent to no Type restriction, and can be used when
  filtering names. Eg,

     obr.names<void>(wordRe..);

- Start brief descriptions with 'Deprecated(YYYY-MM)' so that it is
  readily visible in the short method description. Consistent date
  format (YYYY-MM), placed immediately after the \deprecated tag.

- returns indices of matching entries.

    commit 3f9c7bf4
    commit 3cf177e7

====

ENH: add geometric decomposition constraint (issue #921)

- geometric decomposition constraints may be used to prevent the
  decomposition of regions of the mesh.

  The geometric constraint is applied according to the face centres,
  which define the connectivity between cells.

  Specified in decomposeParDict

    constraints
    {
        geometric
        {
            type    geometric;

            geometry
            {
                box1
                {
                    type    box;
                    min     (-10 -10 -10);
                    max     (1 1 1);
                }

                ball1
                {
                    type    sphere;
                    origin  (-2 -2 1);
                    radius  1;
                }
            }
        }
    }

ENH: add 'grow' option for geometric decomposition constraint (issue #921)

- the 'grow' option includes an additional check to include cell faces
  for any cell that already has two or more of its faces "unblocked".
  This could indicate a connection over a corner, but does not distinguish
  between connectivity introduced by the constraint and the connectivity
  defined by other constraints.

ENH: geometric decomposition constraint using topoSetFaceSource (issue #921)

- replaced use of searchableSurface with a more general and
  more efficient topoSetFaceSource instead.
  Since searchableSurface is also available as a topoSetFaceSource,
  there is no loss in functionality, but using topoSetFaceSource allow
  directly looping over the faces without creating of an additional
  List of volumeTypes.

Work-package-09 geometric constraint

See merge request OpenFOAM-plus!217

- was deprecated for removal with VTK 8.1.0
  definitely removed in VTK 8.2.0

This fixes the static-initialisation order problem - fieldTypes.C
referes to labelIOField etc. which are after it in Make/files and
hence the link order.

- now takes a const UList<T> as input and returns a List<T>
  instead of trying to use the same ListType for both.

  This avoids previously encountered issues when a UList was passed in.

- add specialized bitSet handling within subset(), where we can benefit
  from faster traversal of sparse selections and have a better estimate
  of the final output size.

- handle tmp fields in interpolate methods

- special method interpolateInternal() for creating a volume field
  with zero-gradient treatment for patches from an internal field.

  This method was previously also called interpolate(), but that
  masked the ability to subset the internal field only.

  Ensight output needs the volume field:
      uses interpolateInternal().

  VTK output has separate handling of internal and patch fields:
      uses interpolate().

ENH: added fvMeshSubset mesh() method for baseMesh or subMesh.

- simplies coding when the fvMeshSubset may or may not be in active use.

ENH: update foamToEnsight to use newer methods in wrapped form

- static interpolate functions with renaming for manual use with
  fvMeshSubset (when fvMeshSubsetProxy may be too limiting in
  functionality)

the actuation disk FO

- helps reduce clutter in the topoSetDict files.

  Caveats when using this.

  The older specification styles using "name" will conflict with the
  set name. Eg,

    {
        name    f0
        type    faceSet;
        action  add;
        source  patchToFace;
        sourceInfo
        {
            name   inlet;
        }
    }

    would flattened to the following
    {
        name    f0
        type    faceSet;
        action  add;
        source  patchToFace;
        name   inlet;
    }
    which overwrites the "name" used for the faceSet.

    The solution is to use the updated syntax:

    {
        name    f0
        type    faceSet;
        action  add;
        source  patchToFace;
        patch   inlet;
    }

- faceBitSet, pointBitSet and faceBoolSet (similar to cellBitSet)
  * allows topo sources in a wider variety of places.
  * With copy or move constructors.

- cylinderToPoint, searchableSurfaceToFace, searchableSurfaceToPoint,
  sphereToFace, sphereToPoint sources

- optional innerRadius for sphere and cylinder sources to treat as hollow.

- support "sets" as well as "set" for cellToCell, faceToFace... sources.

  * convenience and avoids writing the set during processing.

- Standard known field types in Foam::fieldTypes namespace

- permits use of these checks for routines wishing to handle their own
  logic.

- now applicable to labelLists.

Note:
  in some situations it will be more efficient to use
  Foam::identity() directly. Eg,

     globalIndex globalCells(mesh.nCells());
     ...
     labelList cellIds
     (
         identity(globalCells.localSize(), globalCells.localStart())
     );

- this helps for trapping unguarded dictionary lookups.

- The change from "solver" to "motionSolver" has not been
  applied consistently for all types of motion solvers.

- previously simply read files until the input stream went bad and no
  more lines could be read.  With the more stringent checking of
  values read (commit 0ce7e364) this approach causes problems.

  Use the underlying tokenizer instead to decide about termination.

- SubField<vector> vs Field<vector>