- erroneous double logic for subset meshes.

  The underlying vtk::vtuCells uses a cellMap to map into a global
  field, which also allows handling of decomposed polyhedral cells.

  If a mesh subset is involved (eg, cellSet, cellZone), then the
  set/zone cellMap can be used to ensure that the original number is
  properly adjusted. For foamToVTK, the meshSubsetHelper already
  does the subsetting and is used when loading fields.

  Does not affect ParaView reader module since there we work on the
  full field and do the subsetting manually (using the cellMap).

Merge develop into master for v1706 release

Closes #505, #509, #497, #502, #500, #498, #493, #492, #490, #485, #486, #484, #481, #480, #467, #473, #470, #466, #464, #463, #460, #462, #458, #418, #420, #391, #452, #454, #453, #439, #427, #415, #422, #414, #411, #400, #398, and #348

See merge request !121

STY: Fixing syntax in rhoPimpleDyMFoam/pEqn.H

by fvMesh.writeObject().

- end user can easily see which arch (endian, label/scalar size) was
  used from the log output, or via -help usage

- this is the same version as OpenFOAM-1612 shipped with and seems to
  have fewer issues than the newer openmpi-2.1.1

Feature rho pimple adiabatic

See merge request !118

Solver for low Mach no. flows with adiabatic thermodynamics and updated
pressure-velocity coupling given by the RCM interpolation procedure
described in

    \verbatim
        Knacke, T. (2013).
        Potential effects of Rhie & Chow type interpolations in airframe
        noise simulations. In: Schram, C., Dénos, R., Lecomte E. (ed):
        Accurate and efficient aeroacoustic prediction approaches for
        airframe noise, VKI LS 2013-03.
    \endverbatim

Original code supplied by Thilo Knacke, CFD E+F GmbH
contact: info@cfd-berlin.com

Integrated into OpenFOAM by OpenCFD Ltd.