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- local version of ntohl for better cross-platform behaviour

STYLE: istringstream/ostringstream instead of stringstream

Updates v2006

See merge request !8

- avoids ambiguity with min(), max() template parameters (float)

- add proper scoping

- had swapped logic for xmax / ymin

- use readIfPresent to simplify code

- adjust Make/{files,options} to install into 'module' locations

     FOAM_MODULE_APPBIN, FOAM_MODULE_LIBBBIN

  If unset, these will default to FOAM_USER_APPBIN, FOAM_USER_LIBBBIN,
  respectively. This recovers the normal, expected behaviour while still
  supporting direct compilation into the main OpenFOAM directories
  if so desired.

  For OpenFOAM-v2006 and later, these can be controlled with the
  FOAM_MODULE_PREFIX (set with -prefix or -module-prefix) to specify
  different locations.

  For earlier and other OpenFOAM versions, the new configuration files
  will still work, but need to define manually instead. For example,

      FOAM_MODULE_APPBIN=/some/install-path/bin \
      FOAM_MODULE_LIBBIN=/some/install-path/lib \
              ./Allwmake

TUT: montereycanyon

STYLE: updated mail address in various locations

STYLE: updated headers

- updated wolfsgrube case to new tools

- updated releaseAreaMapping dictionaries of entrainment and
  simpleslope case to use new version

- Geographic Information System import and export routines with
  reading various types of shapefiles

- new version of releaseAreaMapping with better dictionary structure,
  reading of shapefiles

- relocated HormannAgathos to library for better reuse.

ENH: gridToSTL - to generate STL files from ESRI grid files

- these may be changing upstream (polyMesh constructor), so don't rely
  on defaults here.

Final content for 1806 release

Closes #4

See merge request !5