Solver for the magnetic field generated by permanent magnets.

    A Poisson's equation for the magnetic scalar potential psi is solved
    from which the magnetic field intensity H and magnetic flux density B
    are obtained.

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.