- allows better separation from compiler settings

- use -fPIC instead of legacy -KPIC for intel compiler

solaris:
  - rename WM_ARCH from SunOS to solaris64 for consistency with wmake/rules
  - drop non-64 solaris from wmake/rules
  - remove automatic selection of FJMPI. This should be done in the bashrc
    or prefs.sh file instead.
  - remove old (likely inaccurate) exported flags, rely on wmake -show-xyz
    or user config instead

darwin:
  - remove '-Ddarwin' from the exported WM_CFLAGS, WM_CXXFLAGS.
    Not used elsewhere (ThirdParty)

STYLE: report MPI flavour (WM_MPLIB) when making mpi-related libraries

- the only code location using BiIndirectList are debug sections
  within polyTopoChange.

  No need to construct/assign directly from a BiIndirectList since
  the '()' method provides a simple alternative.

Fix provided by Gavin Ridley.

Fix provided by Gavin Ridley.

- aids with portability and maintenance (#1238)

better cooperation with external MPI initialize / finalize

See merge request OpenFOAM-plus!252

- change from UpdateableMeshObject to TopologicalMeshObject

- change inheritance order to have MeshObject be registered first
  and mark the IOobject descriptor as unregistered

- the objectRegistry destructor seems to be called too late.
  Explicitly clear the objectRegistry within the Time destructor to
  ensure that it always happens.

This reverts commit 708e6509.

- used fallback of 0 instead of the results time.
  This discrepancy caused the case file to have two timesets that
  only differed by the first (incorrect) entry.

- used fallback of 0 instead of the results time.
  This discrepancy caused the case file to have two timesets that
  only differed by the first (incorrect) entry.

- when running in serial but within a processor directory,
  argList::globalPath() is to be used instead of Time.globalPath()
  For other cases there is no difference.

- silence clang warnings

- this is somewhat like labelRange, but with a stride.
  Can be used to define slices (of lists, fields, ..) or as a range specifier
  for a for-loop. For example,

      for (label i : sliceRange(0, 10, 3))
      {
          ...
      }

- removed unused decrement() and increment() methods, which provided
  identical functionality as the ++, +=, --, -= operators.

Adding pMin,Pmax pressure control to buoyantPimple and
chtMultiReagion