- 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

- save in META-INFO/build-info for later re-compilation without git.
  This improves tracking beyond simply referring to the the patch level.

  The information is tagged with an underscore to distinguish from
  "real" build information when git is available.

STYLE: improved shell syntax, pushd/popd guards etc.