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- enumerated values are (points | topology) which can be optionally
  specified in the blockMeshDict. Default is 'topology'.

  If the command-line option `blockMesh -merge-points` is specified,
  this has absolute priority over any blockMeshDict entry.

STYLE: changed blockMesh "-blockTopology" option to "-write-obj"

- this is more specific to what it does. Potentially wish to add a
  "-write-vtk" option in the future.

TUT: adjust tutorials to use preferred or necessary merge strategies:

  * channel395DFSEM - topology
  * nozzleFlow2D - points
  * pipeCyclic - points

Sergio Ferraris authored Apr 20, 2020 and Andrew Heather committed Apr 20, 2020

1) Add interfaceHeatResistance model to icoReactingMultiphaseInterFoam
   This model uses a spread source for the continuity Eq.
   It is recommended for cases with good mesh resolution.

2) Adding iso-surface type of calculation for the interface for
   the kineticGasEvaporation model

3) Add switch for option to take into account volume change

4) Add poolEvaporation tutorial

STYLE: double-quote "$@" for isTest/notTest

- emit "constant " and "uniform " as separate word/space combination

- no stderr redirect needed:
    * 'command -v'

- no stdout/stderr redirect needed:
    * 'rm -f'

STYLE: consistent spacing after redirects

- use git show --ignore-space-change when examining

- add PDRblockMeshDict example for cavity

Based on Goring et al., 1980