BUG: syntax error in settings.sh

- main mplib rules located in GENERAL_RULES with specializations
  (if any) under RULES. Modest change in a few options files, but
  cleans up the rules directories.

  previously in options:
      include $(RULES)/mplib$(WM_MPLIB)

  now in options:
      sinclude $(GENERAL_RULES)/mplib$(WM_MPLIB)
      sinclude $(RULES)/mplib$(WM_MPLIB)

  For GNU make it would be permissible to write both in a single line.

- "cpp -traditional-cpp" doesn't strip C++-style comments
  Probably need a workaround with sed -e 's@^ *//@@' if we
  wish to support C++-style comments in Make/{files,options}

- lduMatrixTests.C:121:1:
  error: ‘Foam::lduMatrix::solverPerformance::solverPerformance’ names
  the constructor, not the type

- edgeFaceCirculatorI.H:355:1:
  error: ‘Foam::edgeFaceCirculator::edgeFaceCirculator’ names the
  constructor, not the type

- patchPointEdgeCirculatorI.H:236:1:
  error: ‘Foam::patchPointEdgeCirculator::patchPointEdgeCirculator’
  names the constructor, not the type

- objToVTK.C:116:5:
  error: ‘Foam::argList::argList’ names the constructor, not the type

  same in surfaceClean.C, surfaceRefineRedGreen.C, surfaceSplitByPatch.C

- fireFoam/createFields.H:74:41:
  error: type/value mismatch at argument 1 in template parameter list
  for ‘template<class T> class Foam::autoPtr’

ATTENTION: cpp now needs '-traditional-cpp' for single-line output

- (have been disabled for more than 1 year)

- used during parcel calc() function to flag whether the parcel should be tracked
- if false, parcel not tracked, but sub-models are still active
- useful, e.g. for particle 'stick' condition
- NOTE: stored as a bool, but read/written as a label for restarts/post-processing

- adds more DWIM (do what I mean) intelligence to wmake

ENH: use ~/.OpenFOAM/.wmake instead of ~/.wmakeScheduler for the lock dir

- keeps more of the OpenFOAM bits together

- use enhanced Switch constructor and the new valid() method to
  avoid potential pitfalls of using Switch::switchType directly.

- add operator=(const switchType) to avoid this type of problem:

      Switch sw;
      sw = Switch::asEnum("foo", true);
      if (sw) ...  // evaluated incorrectly

- add constructor Switch(const switchType) for convenience

- add valid() method to avoid using the switchType directly

We filter them out now when constructing the adjacency structure.

non constraint patchFields on constraint patch types (all fields)

field directly.

Renaming Ftot to accelTot to remind that the functions return
accelerations.