- 'unfriend' operators on dimensionSet, since they operate without
  requiring access to non-public members.

- add missing invTransform() function for dimensionSet.

- make inv(const dimensionSet&) available as
  operator~(const dimensionSet&), which can be used instead
  of (dimless/ds).

- writing of dictionary entry with the name of the dimensionedType
  suppressed if it is identical to the keyword.
  This corresponds to the input requirements.

- deprecate dimensionedType constructors using an Istream in favour of
  versions accepting a keyword and a dictionary.

  Dictionary entries are almost the exclusive means of read
  constructing a dimensionedType. By construct from the dictionary
  entry instead of doing a lookup() first, we can detect possible
  input errors such as too many tokens as a result of a input syntax
  error.

  Constructing a dimensionedType from a dictionary entry now has
  two forms.

  1.  dimensionedType(key, dims, dict);

      This is the constructor that will normally be used.

      It accepts entries with optional leading names and/or
      dimensions. If the entry contains dimensions, they are
      verified against the expected dimensions and an IOError is
      raised if they do not correspond. On conclusion, checks the
      token stream for any trailing rubbish.

  2.  dimensionedType(key, dict);

      This constructor is used less frequently.

      ...

- check Istream in readBool in operator>> variant (#1033)

See merge request OpenFOAM-plus!220

Code supplied by Daniel Rettenmaier rettenmaier@gsc.tu-darmstadt.de

- fix range checks

- use forwarding templates for the factory method

- avoid double use of dynamic_cast.
  Don't need implicit use in isA<>, can use result directly

STYLE: updated iteration over HashTable of mesh objects

- was using coordinate-system and transform() which is the
  local-to-global mapping, whereas it should be invTransform() which
  is the global-to-local mapping

- simplifies things for legacyCompile

- 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 OpenFOAM-plus!218

uniformFixedValue: avoid re-evaluation on reading or mapping

See merge request OpenFOAM-plus!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);

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

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