- allows use of Enum in more situations where a tiny Map/HashTable
  replacement is desirable. The new methods can be combined with
  null constructed for to have a simple low-weight caching system
  for words/integers instead of fitting in a HashTable.

- polymorphic field/result

- improves usability in other contexts

ENH: expose topoSet::findIOobject as public

- since pointPatchField is not derived from Field, methods such as
  negate() or a unary min(), max() are missing.

  These have apparently not been needed thus far, but are used
  indirectly via GeometricField.

STYLE: split off into separate file

- can be used in combination with std::generate, or as a substitute
  unary operator to supply random numbers for std::transform.

- the noOp now returns const reference, noexcept

- improves similarity to autoPtr. Simplifies coding.

  Example,

    tmp<volScalarField> tfield;

    // sometime later...

    tfield.reset
    (
        volScalarField::New("myfield", mesh, dimensionedScalar(Zero))
    );

- as per tmp, disallow tmpNrc assignment from literal nullptr

- as per autoPtr, allow explicit test as bool (same as valid).

Example,

     ($radius > 10) ? sin(degToRad(45)) : cos(degToRad(30))

- protect division and modulo against zero-divide.

- add scanner/parser debugging switches in the namespace,
  selectable as "stringToScalar". For example,

    debug parser:  foamDictionary -debug-switch stringToScalar=2
    debug scanner: foamDictionary -debug-switch stringToScalar=4
    debug both:    foamDictionary -debug-switch stringToScalar=6

- this allows use of #eval results in the tests

- this makes it behave more like other dictionary components.

- can be useful when a scalarField has been used to store booleans and
  we need to recover a bool directly and deal with potential rounding
  issues.

ENH: support "any" as a Switch counterpart to "none"

- now indicate that the dictionary entry is missing, not that it is
  an unknown function type.

STYLE: adjust PatchFunction1New.C to have logic structure look similar

- handle quoted format statement (m4)

- avoids generating a log file, which is missing an "End" tag that
  allows the test loop to identify the completion status

- also use tmp::New forwarding internally

- the full tensor also supports zip/unzip rows/cols
  and unzipRow, unzipCol, unzipDiag

- also support transposed construction when given a set of vectors