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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.

Patch contributed by Mattijs Janssens
Resolves bug-report http://bugs.openfoam.org/view.php?id=2278

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

linearUpwind: Evaluate the gradient of each component of the field to provide support all field types

Also reduces peak-storage as it now generates a volVectorField for each component
rather than the gradient of the field type.

Resolves bug-report http://bugs.openfoam.org/view.php?id=2189

Renamed the original volRegion -> volFieldValue to clarify the purpose
of this class to process vol fields on a volRegion.

functionObjects: Further simplification and rationalization using the fvMeshFunctionObject base-class

Requires gcc version 4.7 or higher

DimensionedField<vector, volMesh> -> volVectorField::Internal

CrankNicolsonDdtScheme: Corrected handling of the boundary field to avoid premature reset of the time-index
Resolves bug-report http://bugs.openfoam.org/view.php?id=2162

Resolves bug-report http://bugs.openfoam.org/view.php?id=2163

rather than being calculated on construction and stored as member data.

The convergence warning has be replaced with the 'convergence()' member
function which returns 'true' if the SVD iteration converged, otherwise 'false'.

Patch contributed by Mattijs Janssens
Resolves bug-report http://bugs.openfoam.org/view.php?id=2143