nuSgsUSpaldingWallFunction removed, now use nutUSpaldingWallFunction

nuSgsUSpaldingWallFunction removed, now use nutUSpaldingWallFunction

nuSgsUSpaldingWallFunction removed, now use nutUSpaldingWallFunction

nuSgsUSpaldingWallFunction removed, now use nutUSpaldingWallFunction

This reverts commit c5bea524.

This reverts commit b18f6cc1.

eg,
    - makePatchTypeField -> makeTemplatePatchTypeField
    - makeNonTemplatedPatchTypeField -> makePatchTypeField

This reverts commit ad287d9d.

This reverts commit e2968b6a.

 - names updated to reflect what they are based on, e.g. either k
   or U

- avoids raw values sprinkled about the code
  eg, 'defaultKappa_'  vs. '0.41'

- added constructor dictionary(const dictionary*) that also handles NULL
  pointers and makes it convenient to construct from a possibly nonexistent
  sub-dictionary:
  eg,
      dictionary dict2(dict1.subDictPtr("someDict"));

- make some of the turbulence Coeffs sub-dictionary optional.
  Their contents are all 'lookupOrAddDefault' anyhow.

- in turbulentMixingLength BCs, skip namespace qualifier in template
  (eg, <RASModel> vs. <compressible::RASModel>)

- change comments from 'turbulenceProperties' to RASProperties/LESProperties

- consistency between compressible/incompressible - no separate file for
  'New' selector etc

- consistency in accessing the model coefficients.
  Use method coeffDict() for const access.
  Use protected data member coeffDict_ for read/write access.

- document model coefficients in etc/constant/RASProperties.
  Need the same for LESProperties before we can prune these from the
  tutorials.