- split mapping off from refinement
- introduce cell-split faces (hexRef8) as create-out-of-nothing

- easier when making modifications

STYLE: spelling in topoSetSource comments

- this seems to be the only reliable means of obtaining the values.

  Using typeName_() yields the wrong value.

  Using the typeName causes initialization issues
  (segfault when executing on some systems).

- resolves better on some compilers.

Feature ioobjectlist registry

See merge request !218

uniformFixedValue: avoid re-evaluation on reading or mapping

See merge request !219

- support name filtering by class based on <Type> or predicates.
  Eg,

      objects.sortedNames<volScalarField>(namePattern);
  vs  objects.sortedNames(volScalarField::typeName, namePattern);

  These can also be used directly for untyped name matching.
  Eg,
      objects.sortedNames<void>(namePattern);

  Can also use a predicate:

      objects.sortedNames(wordRe("vol.*Field"), namePattern);
      objects.sortedNames
      (
          [](const word& clsName){ return clsName.startsWith("vol"); },
          namePattern
      );

- add IOobjectList::count() methods

- lookupClass<Type>() to use types instead of class variables.

- additional helpers for parallel: allNames(), checkNames()

- provide filterClasses() and filterObjects(), prune_0() method
  forwarding to HashTable methods for easier access.

- can be useful for obtaining information about number of fields.
  Eg,

       nScalar = mesh.count<volScalarField>(wordre);

- in parameter form, check if it headerClassName() corresponds to the
  specified class name

- in templated form, check if headerClassName() corresponds to the
  Type:typeName value.
  Specialization for <void> always returns true (ie, no checks)

- replace explicit use of wordRe, wordRes, wordHashSet as filters
  with a MatchPredicate.

- support filtering by class based on <Type> or predicates

- replace explicit use of word, wordRe, wordRes, wordHashSet as filters
  with a MatchPredicate, since they all satisfy the requirements for
  use a predicate. This change reduces code duplication, allows other
  matcher types (eg, keyType) as well as lambda functions.

- add special treatment for a 'const char*' parameter
  for lookupClass() and the now-deprecated single item lookup() method
  to promote these parameters to 'word'.

- 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 6088f441
    commit 361a4351

====

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 !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

- these parts work with a polyMesh (don't need fvMesh)