ENH: Avoidding 0/0 conflict in externalCoupledTemperatureMixed increaging the zero order of denomitaror

BUG: steadyStateDdtSchems - corrected oriented state of return fields for *Corr functions.  Fixes #634

Bugfix multi level decomp

Closes #620 and #619

See merge request OpenFOAM-plus!153

- previously when more than two levels were used.
  Now calculate the required final target domain segment directly.

BUG: thermoFoam - corrected to enable restart and post-processing using thermoFoam -postProcess.  Fixes #598

ENH: Adding required interpolation for alpha.water in fvSchemes for overInterDyMFoam floatingBody tutorial

BugFix: corrected keyword for flowRateInletVelocity BC fixes #577

Closes #577

See merge request !143

- installed under /usr/include/scotch/scotch.h

ENH: obtain fallback value for SCOTCH_VERSION from the header

COMP: add support for metis, scotch static libraries (eg, EasyBuild)

- 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