- not used by the ISstream parser, but suitable for other parsing
  methods where true/false concept should be distinguishable from
  integer values.

  Only constructed via the token::boolean() static method, not
  directly assignable.
  This avoids any potential ambiguities with label.

coordinate system improvements

See merge request OpenFOAM-plus!211

- avoids some doubled slashes

STYLE: simplify concatenation of processor directory names

- adjust member order in TimePaths to better packing

- local token shifting was missing when getting the next file chunk
  (while in the middle of parsing that text).

  As well as adding the correct shifting, also tag the local buffer
  with nullptr when it is done. Be extra paranoid and check the
  raw buffer range before passing off to std::string.

- for finer control of the '-help' output text

- this also removes the '-newTimes' option cruft from appearing
  everywhere. reconstructPar and redistributePar are unaffected by this
  since they define their own -newTimes option independently.

Compilation problems on older compilers

This reverts commit baf3e931.

    UPtrList::set(const label i, T* ptr);

No-op if the new pointer value is identical to the current content.
This avoid memory management issues.

- useful for customizing the behaviour of white/black lists depending
  on the type of the match.

- same as !isPattern(), but can be more readable.

- add wordRe enum state 'UNKNOWN', which has the identical value as
  'DETECT' but used for a return value.

overPimpleDymFoam

for correct run time reading.
Setting up twoSimpleRotors tutorial for smooth pressure
fluctuations

- searchable surfaces
- pointToPointPlanarInterpolation
- sampled planes
- surfaceMeshConvert, surfaceMeshExport, surfaceMeshImport

- arraySet :
     was translate + transform
     now use globalPosition (== transform + translate).

     Explicitly limit to Cartesian coordinate system for clarity.

- can now construct with READ_IF_PRESENT and use count() to determine
  if it was loaded. names() and sortedNames() for a collected overview.

- makes an easier overview of the rotation matrix coefficients
  (issue #863).

  Provided as a distinct commit for easier examination of the lines changed.

- improve handling of degenerate cases for the two-axes specification.

- the movable type is List&& or Field&&

- allows reuse for other purposes