Set the m4 -I include accordingly to have the folllowing:
  - the directory of the parser.
  - include/ in the top-level source tree of the current target
    (eg, src/finiteVolume/include-m4/ when compiling libfiniteVolume)
  - include/ from OpenFOAM

Additional -dry-run option for makeParser, wrap-lemon for expanding m4
only.

Extend m4 wrapping support to include bison as well.

- include the trailing newline for the "// comment" form, but also add
  in leading space removal. This ensure that we do not introduce odd
  indentation, while also eliminating lines that are solely C++
  comments.

- output the "uniform", "nonuniform" Field entry tags as words instead
  of raw character strings, which can help for direct tokenization or
  when sending/receiving via Pstreams.

- The case files may contain #... comment lines
- The geometry file may contain an optional "extents" entry
- Properly handle element id specifications (off|assign|ignore|given).

- Partially handle node id specifications (off|assign|ignore|given).
  Treat "given" like "ignore", since results in the lightest amount of
  coding and in many cases the "given" node ids are in fact 1-based
  contiguous values and thus no different than "ignore" for our
  purposes.

- previously only had 'opt<..>()' for options, but 'get<..>()'
  provides more similarity with dictionary methods.
  The 'opt<..>()' method is retained.

- 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.

ENH: downgrade error on type-mismatch to a warning

- Ensight data files generated by OpenFOAM will start with the name of
  the data type (Eg, "scalar", "vector" etc), but this convention may
  fail for data files that have been generated elsewhere.

- 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.