- preferentially handle Allwmake.override, which allows packaging
  tools to define alternative make scripts, or selectively disable
  components.

- remove legacy handling of 'Optional' directory.
  Conditionals have since migrated into scripts themselves and/or
  use the wmake/scripts/have_* framework.

BUG: missed passing -debug for Allwmake scripts

- makes it easier to run/clean individual cases

Enabled postProcess on film region for reactingParcelFoam

See merge request Development/openfoam!352

* Use cast for std::pow(??, z).
* No cast for std::pow(z, ??) - already properly specialized.

- log to stdout when explicitly enabled

- missed detection of system libraries when installed with multiarch
  paths like /usr/lib/x86_64-linux-gnu

CONFIG: improve handling of group/user config files (#928)

- changed bashrc handling of FOAM_CONFIG_NOUSER to use
  FOAM_CONFIG_MODE instead. Propagate into foamEtcFile to make this
  a stickier control.

  This change allows better control, but also enables cluster
  installations to define their own value within the OpenFOAM prefs.sh
  file to prevent users accidentally mis-configuring things if
  necessary.

- remove undocumented handling of an (a)ll mode in foamEtcFile to
  avoid potential pitfalls.

- add support for FOAM_CONFIG_ETC handling.
  This allows injection of an extra search layer when finding
  project etc files

ENH: improvements to foamConfigurePaths (#928)

- handle FOAM_CONFIG_ETC implicitly, or explicitly with the new
  -etc option.

STYLE: more explicit wording in foamConfigurePaths usage (#1602)

- document that an absolute path (eg, -scotch-path) overrides/ignores
  the equivalent ThirdParty setting (eg, -scotch)

- longer options -system-compiler and -third-compiler for -system
  and -third, respectively. Clearer as to their purpose.

- adjust the location sanity check to look for META-INFO directory.

- allows custom tuning of compilation parameters

- '-c' option (as per shell), '-Dkey[=value]' option to provide
  preferences via the command-line. For example,

      etc/openfoam -DWM_COMPILER=Clang -int64  ./Allwmake -j -s -l

  These can also be combined with other options. Eg,

      etc/openfoam -DWM_COMPILER=Clang \
          -c 'wmake -show-path-cxx -show-cxxflags'

- relocated from bin/tools/ => etc/ for easier access

- bin/tools/openfoam.in : for autoconfig-style installation

- Auto-detect if the shell script was executed with openfoam and
  interpret accordingly.

  Simple example,

      --------------
      #!/usr/bin/openfoam
      cd "${0%/*}" || exit   # Run -*-sh-*- from this dir

      blockMesh
      simpleFoam
      --------------

   Note it is NOT currently possible to provide any other parameters
   this way. Eg,

      `#!/usr/bin/openfoam -sp` (NOT)

   This will either fail to run, or result in infinite recursion.

- make tar-file generation more flexible

Feature surface handling

See merge request Development/openfoam!343

- base level surface container is now a meshedSurface instead of
  a triSurface. This avoid automatic triangulation of surfaces
  when they are read, and simplifies the internals.

- sampling types:
  * "meshedSurface" (compat: "sampledTriSurfaceMesh")
  * "meshedSurfaceNormal" (compat: "sampledTriSurfaceMeshNormal")

- uses MeshedSurface instead of triSurface to prevent automatic
  triangulation.

- supports '-patches' and '-excludePatches' controls as per foamToVTK.
  For example,

    surfaceSplitByPatch -patches '( ".*rider.*" )'  motorBike.obj

ENH: use MeshedSurface for surfaceSubset

- removed swapZones method (unused, potentially fragile)

- add subsetMesh by name

BUG: incorrect zone assignment in MeshedSurface::subsetMesh

- used the new (zero-sized) zone when determining the old zone ending
  instead of the original zone bounds.

- use local branching for face maps to reduce code complexity
  and duplication

- refactor logic from triSurfaceMesh for triSurface, MeshedSurface,
  UnsortedMeshedSurface.

  Makes it easier to locate and use surface files without the
  triSurfaceMesh (meshTools) infrastructure.

STYLE: remove unused sampledTriSurfaceMesh constructors