- Remove the unused enums() method since it delivers wholly unreliable
  results. It is not guaranteed to cover the full enumeration range,
  but only the listed names.

- Remove the unused strings() method.
  Duplicated functionality of the words(), but was never used.

- Change access of words() method from static to object.
  Better code isolation. Permits the constructor to take over
  as the single point of failure for bad input.

- Add values() method

- do not expose internal (HashTable) lookup since it makes it more
  difficult to enforce constness and the implementation detail should
  not be exposed. However leave toc() and sortedToc() for the interface.

STYLE: relocated NamedEnum under primitives (was containers)

- internal typedef as 'value_type' for some consistency with STL conventions

- The unset() method never auto-vivifies, whereas the set() method
  always auto-vivifies. In the case where set() is called with a zero
  for its argument - eg, set(index, 0) - this should behave
  identically to an unset() and not auto-vivify out-of-range entries.

- This follows the same idea as cbegin/cend and is helpful when using
  C++11 auto to ensure we have unambiguous const-safe access.

  Previously:
  ====
    typename someLongClass::const_iterator iter = someTable.find(key);

    ... later on:
    *iter = value; // Oops, but caught by compiler.

  We can save some typing with auto, but it is uncertain what we get:
  ====
    auto iter = someTable.find(key);
        // iterator or const_iterator?
        // depends on someTable having const or non-const access.

    ... later on:
    *iter = value;  // Oops, but not caught by compiler.

  Using cfind instead, auto will deduce const_iterator as the type:
  ====
    auto iter = someTable.cfind(key);  // definitely const_iterator

    ... later on:
    *iter = value; // Oops, but caught by compiler.

- when a plain word is used as a directory-local name for file.
  We don't have a full blown fileName, but still want to check/remove
  extensions etc.

- both classes are nearly identical and should be merged in the future.

Related to #482 but this one is the handling inside argList.

Some versions of lsof print the mount point (if remote) after the
script path:
    /hosts/mymachine/OpenFOAM/OpenFOAM-plus.develop/etc/cshrc (mymachine:/home)
This now gets filtered out.

Initial attempt to track oriented surface fields

See merge request !104

Merge branch 'feature-oriented-fields' of develop.openfoam.com:Development/OpenFOAM-plus into feature-oriented-fields

STYLE: adjust parameter names and template types in invertManyToMany

- more explicit about the acceptable list types

- The inGroups is a wordList.
  It can be flattened on output to make files more readable.

- holding a pointer instead of a reference for edgeFaceCirculator
  simplifies overall handling.

Integration foundation

See merge request !99

Further hash table iter clean-up

See merge request !113

Hash table method enhancements

See merge request !112

COMP: avoid undefined-var-template warning in runTimePostProcessing