- more consistent with STL practices for function classes.

- string::hash function class now operates on std::string rather
  than Foam::string since we have now avoided inadvertent use of
  string conversion from int in more places.

- Eg instead of using labelHashSet, used HashSet<label> which uses
  the string::hash for hashing. Other places inadvertently using the
  string::hash instead of Hash<label> for hashing.

STYLE: use Map<..> instead of HashTable<.., label, Hash<label>>

- reduces clutter

- reduces some ambiguity and clarifies the expected output and
  behaviour.

STYLE: reduce some automatic conversions of char to string

- avoid confusion by using HashTable::lookup(key, deflt) explicitly
  instead of allowing an operator() version.

- add copy construct from UList

- remove copy construct from dissimilar types.

  This templated constructor was too generous in what it accepted.
  For the special cases where a copy constructor is required with
  a change in the data type, now use the createList factory method,
  which accepts a unary operator. Eg,

      auto scalars = scalarList::createList
      (
          labels,
          [](const label& val){ return 1.5*val; }
      );

BUG: primitiveMesh: cellPoints, cellEdges inconsistent API. Fixes #703.

See merge request OpenFOAM-plus!189

It creates a swirling velocity across a baffle using jumpCyclic for vectors

- sentinel was not working properly when building user-space routines

- now warn about the following:
  * the bounding box does not overlap wih the global mesh
  * plane does not intersect the (valid) bounding box
  * plane does not intersect the global mesh

- add bounding to the "plane" variant of a sampled plane.

-  boundBox::nDim() to assess dimensionality

- boundBox::intersect(const plane&) to test if plane intersects the
  bounding box

STYEL: use constexpr for VectorSpaceOps

- runTimeModifiable change to the dictionary not being propagated to
  the underlying functionObjects

- forward command-line arguments for paraview, where they may also be
  evaluated (cshrc, POSIX shell)
  Eg,
      . etc/bashrc ParaView_VERSION=5.4.1-mpipy
      source etc/cshrc ParaView_VERSION=5.4.1-mpipy

- this currently just strips off the leading parent directory name

     "/this/path/and/subdirs/name"

     relative("/this/path")  -> "and/subdirs/name"
     relative("/this")       -> "path/and/subdirs/name"

ENH: Adding optional output information ordered by injectorID to LocalInteraction.

See merge request OpenFOAM-plus!187

- adjust return values of HashSet operators.

- problems when the cloud was not available on all processors.

- NB: ensight measured data only allows a single cloud, but
  foamToEnsight writes all clouds.

'delta'

The scheme should now be specified using, e.g.

    div(phi,U)      Gauss DEShybrid
        linear                    // scheme 1
        linearUpwind grad(U)      // scheme 2
        hmax                      // LES delta name, e.g. 'delta', 'hmax'
        0.65                      // DES coefficient, typically = 0.65
        30                        // Reference velocity scale
        2                         // Reference length scale
        0                         // Minimum sigma limit (0-1)
        1                         // Maximum sigma limit (0-1)
        1.0e-03;                  // Limiter of B function, typically 1e-03

This reverts commit 0ee1ed63.