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- purely cosmetic (documentation) changes

Resolves bug-report http://bugs.openfoam.org/view.php?id=2294

Resolves bug-report http://bugs.openfoam.org/view.php?id=2287

This supports the abstraction of the set of fields from the field code
generation macros making it easier to change the set of fields supported
by OpenFOAM.  This functionality is demonstrated in the updated
fvPatchFields macros and will be applied to the rest of the field code
generation macros in the future.

fvPatchFields: Constructors from dictionary now call the corresponding constructor of the fvPatchField base-class
to ensure 'patchType' is set as specified.

Required substantial change to the organization of the reading of the
'value' entry requiring careful testing and there may be some residual
issues remaining.  Please report any problems with the reading and
initialization of patch fields.

Resolves bug-report http://bugs.openfoam.org/view.php?id=2266

Requires gcc version 4.7 or higher

Now a case can be sampled and written in 'foam' format and used for the
timeVaryingMappedFixedValue BC of another case.

Reference:
    Poletto, R., Craft, T., and Revell, A.,
    "A New Divergence Free Synthetic Eddy Method for the
    Reproduction of Inlet Flow Conditions for LES",
    Flow Turbulence Combust (2013) 91:519-539

  - patchFields now get mapped (instead of created)
  - with -consistent it now maps all patches except for processor ones (they are
    the only ones that are processor-local)
  - all constraint patches get evaluated after mapping to bring them up to date.

Patch contributed by Mattijs Janssens

totalPressureFvPatchScalarField, uniformTotalPressureFvPatchScalarField: simplified and rationalized

    The modes of operation are set by the dimensions of the pressure field
    to which this boundary condition is applied, the \c psi entry and the value
    of \c gamma:
    \table
        Mode                    | dimensions | psi   | gamma
        incompressible subsonic | p/rho      |       |
        compressible subsonic   | p          | none  |
        compressible transonic  | p          | psi   | 1
        compressible supersonic | p          | psi   | > 1
    \endtable

    For most applications the totalPressure boundary condition now only
    requires p0 to be specified e.g.
    outlet
    {
        type            totalPressure;
        p0              uniform 1e5;
    }

updateCoeffs(const scalarField&) -> updateWeightedCoeffs(const scalarField&)

to avoid confusion with other specialized forms of updateCoeffs.

Patch contributed by Mattijs Janssens

- cyclicACMIFvPatchField::updateCoeffs() now again redirects to
fvPatchField::updateCoeffs(const scalarField& weights);
- which redirects to fvPatchField::updateCoeffs();
- except on wall functions where the weights are used to switch off
  turbulence generation
- renamed the updateCoeffs on the fixedFluxPressure bc to updateSnGrad.

- relocate common dictionary output into codedBase class