- return Ostream&
- make header separation optional

- empty(), size(), toc(), sortedToc()

- makes the standard config variables more visible

- add an 'isoAlgorithm' keyword to distance surface and cutting plane
  to advance further testing of the isoSurfaceTopo algorithm.

  Does not yet handle the full spectrum of bound boxes, cellZones etc.

- to simplify/unify error handling

STYLE: use NotImplemented instead of longer notImplemented(...)

- unfriend HashSet, HashTable IO operators

- global min(), max(), minMax() functions taking a labelHashSet and an
  optional limit. For example,

      labelHashSet set = ...;

      Info<< "min is " << min(set) << nl;
      Info<< "max (non-negative) " << max(set, 0) << nl;

- make HashTable iterator '->' dereferencing more consistent by also
  supporting non-pointer types as well.

- read HashTable values in-situ to avoid copying

- the Enum::readEntry() method was previously as bit sloppy with
  respect to the enumeration that it accepted. If the input was
  non-mandatory, typos would go unnoticed. Now tighten things so that
  if an enumeration is found, it must also be valid.

STYLE: remove unused/deprecated Enum::lookupOrFailsafe() method

- this was only used in a few places internally in 1712 and 1806 but
  has since then been superseded by getOrDefault() with an optional
  'failsafe' flag.

- previously deprecated and slated for removal in 2018-03

- add triSurface::subsetMesh single-parameter variant

- An identity is often useful when generating connectivity and offset
  information.

- The optional repeat value for vtk::write() allows it to also be used
  as a fill method.

- reduced clutter. Mostly only need to scan source tree.

- 00-dummy: use wmake/src/Allmake to get native (not cross-compiled)
  wmake toolchain binaries

Modifications to help avoid inadvertent overwriting of tutorialsTest:

- new '-force' option to overwrite existing directory

- generate a 'tutorialsTest/Alltest' script that disallows the
  possibilty of self-recursion

- reverse mapping for the original point ids. This can be useful
  when searching a subset of points, but needing to store access to
  the original point index.

- move constructor.

- Allow use/not-use subset as an optional constructor argument for
  more convenient caller logic.

- add PDRblockMeshDict example for cavity

- don't need extra nullptr check for some cases. Less clutter.

- changed for 1906 to have a regIOobject always cleanup its
  objectRegistry entry. No need to explicitly 'release' ownership
  for this to now happen.

- doxygen formatting for MeshObject

Caveat: The -Wdeprecated-copy produces many, many compiler warnings

TODO: need to revisit