ENH: place more patch field attributes under template invariant Base

- attributes such as assignable(), coupled() etc

- common patchField types: calculatedType(), zeroGradientType() etc.
  This simplifies reference to these types without actually needing a
  typed patchField version.

ENH: add some basic patchField types to fieldTypes namespace

- allows more general use of the names

ENH: set extrapolated/calculated from patchInternalField directly

- avoids intermediate tmp

applications/solvers/stressAnalysis/solidDisplacementFoam/tractionDisplacement/tractionDisplacementFvPatchVectorField.C

@@ -47,7 +47,7 @@ tractionDisplacementFvPatchVectorField
     traction_(p.size(), Zero),
     pressure_(p.size(), Zero)
 {
-    fvPatchVectorField::operator=(patchInternalField());
+    fvPatchField<vector>::patchInternalField(*this);
     gradient() = Zero;
 }
 
@@ -79,7 +79,7 @@ tractionDisplacementFvPatchVectorField
     traction_("traction", dict, p.size()),
     pressure_("pressure", dict, p.size())
 {
-    fvPatchVectorField::operator=(patchInternalField());
+    fvPatchField<vector>::patchInternalField(*this);
     gradient() = Zero;
 }
 

applications/solvers/stressAnalysis/solidEquilibriumDisplacementFoam/tractionDisplacementCorrection/tractionDisplacementCorrectionFvPatchVectorField.C

@@ -47,7 +47,7 @@ tractionDisplacementCorrectionFvPatchVectorField
     traction_(p.size(), Zero),
     pressure_(p.size(), Zero)
 {
-    fvPatchVectorField::operator=(patchInternalField());
+    fvPatchField<vector>::patchInternalField(*this);
     gradient() = Zero;
 }
 
@@ -79,7 +79,7 @@ tractionDisplacementCorrectionFvPatchVectorField
     traction_("traction", dict, p.size()),
     pressure_("pressure", dict, p.size())
 {
-    fvPatchVectorField::operator=(patchInternalField());
+    fvPatchField<vector>::patchInternalField(*this);
     gradient() = Zero;
 }