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- use the dictionary 'get' methods instead of readScalar for
  additional checking

     Unchecked:  readScalar(dict.lookup("key"));
     Checked:    dict.get<scalar>("key");

- In templated classes that also inherit from a dictionary, an additional
  'template' keyword will be required. Eg,

     this->coeffsDict().template get<scalar>("key");

  For this common use case, the predefined getXXX shortcuts may be
  useful. Eg,

     this->coeffsDict().getScalar("key");

Avoids the clutter and maintenance effort associated with providing the
function signature string.

- separated out the geometry handling into the 'regionModels' library
- regionModels currently includes single layer and 1-D regions
- surface film modelling over-hauled

This reverts commit c5bea524.

This reverts commit b18f6cc1.

Exception: applyWallFunctionBoundaryConditions.C cannot split #include
directives.

before:
    - 'new' prefixed to camel-cased class name: eg, someClass -> newSomeClass
    - 'New' prefixed to templated class name:   eg, TmplClass -> NewTmplClass
    - 'New' suffixed to class name:             eg, someClass -> someClassNew

after:
    - consistent 'New' suffixed to class name, no change of case
          eg, someClass -> someClassNew
          eg, TmplClass -> TmplClassNew