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- previously used the size of distributed roots to transmit if the
  case was running in distributed mode, but this behaves rather poorly
  with bad input. Specifically, the following questionable setup:

      distributed true;
      roots ( /*none*/ );

  Now transmit the ParRunControl distributed() value instead,
  and also emit a gentle warning for the user:

      WARNING: running distributed but did not specify roots!

- add "point data" or "face data" note to the boundaryData output
  for easier diagnositics in the future.

- for v2106 restricted the input conversion of string types to disallow
  treating verbatim strings as possible word input.
  However, it was too strict in just allowing quoted strings
  and should have also permitted '$'-sigil variables as well.

- ensure that errors for bad string -> word input conversion
  are raised from within the '>>' read operator. These were
  previously triggered during the stripping process, which
  made error tracing more difficult.

  Issue first shows up on gcc-11 with these types of library symbols:

     U Foam::tableReader<double>::dictionaryConstructorTablePtr_[abi:cxx11]
  xx B Foam::tableReader<double>::dictionaryConstructorTablePtr_

  Use concrete hasher functor for runtime selection tables, which
  avoids any additional template resolutions (introduced with
  95cd8ee7). The library symbols now resolve _without_ an
  additional abi:cxx11 tag.

Minor clean-up

Hot fixes for v2106

See merge request !474

ENH: Adding subMesh option to momentumError and div FOs

See merge request !463

sergio authored Jun 22, 2021 and Mattijs Janssens committed Jun 23, 2021

1) Adding subMesh capabilities to momentumError and div FOs.
	- A subMesh is created from cellZones.
	- The operators (div, etc) are only calculated in the subMesh.

2) Optionally, halo cells can be added to the cellZones.

3) New helper class to handle the subMesh creation and field mapping.

TUT: multiphase: replace boatAndPropeller with rigidBodyHull

See merge request !473

ENH: less cryptic error message in surfaceWriters::vtkWriter

- fall back to nFields=1 and report the problem.

- add setter/getter methods for the zone selection

- construct for multiple zone selection

- support explicit zone ids instead of name matcher

- add setter/getter methods for number of grow/shrink steps,
  which allows reuse of the same object.

- remove the lower input hard-limit of 1 step, to allow definition of
  a no-op filter.

- drop early exit from grow/shrink cycle (potential parallel issues).

CONFIG: set API level to 2106 in ramp-up for release

- previously a function (unlike the csh version) but since bashrc and
  setup have been split -> replace with inline definition

STYLE: formatting/wording for openfoam starters

TUT: simplify controlDict modification, add default substitution

ENH: accept '/' for end-of-options terminator (etc/openfoam)

- makes the application or service more apparent.
  * eg.  /usr/bin/openfoam / blockMesh
  * vs.  /usr/bin/openfoam -- blockMesh

  Accept lone '-' as the end-of-options terminator, as per bash

- Adjust handling of openfoam '-c' option to flag that a command-string
  will appear, but continue with option parsing.
  Consistent with bash definition.

- in the 'auto' mode (now the default), it will use cleanCase and also
  remove the 0/ directory if a 0.orig/ directory also exists.

  This corresponds to a frequent idiom and can be used quite safely
  for most cases.

ENH: add -serial / -parallel preference for foamRunTutorials

- adjust commented-out evaluation to avoid warnings.

  With code like this
  ```
  #if 0
  nxin    #eval{ round($nxin / 5) };
  #endif
  ```

  The handling of the "#if 0 / #endif" clause uses the plain ISstream
  parser to tokenize. This means that the "round(" is parsed as a word
  with a mismatched closing ')', whereas the "#eval" parser will slurp
  everything in until the closing brace and send it off as a string
  to the expression parser.

STYLE: PDRFOAM End of Program was inconsistent with other applications

See merge request !447