externalWallHeatFluxTemperature: Allow manipulation of the boundary values

Provides support for the limitTemperature fvOption.

Resolves bug-report https://bugs.openfoam.org/view.php?id=2675

src/TurbulenceModels/compressible/turbulentFluidThermoModels/derivedFvPatchFields/externalWallHeatFluxTemperature/externalWallHeatFluxTemperatureFvPatchScalarField.H

@@ -246,6 +246,15 @@ public:
 
     // Member functions
 
+        // Access
+
+            //- Allow manipulation of the boundary values
+            virtual bool fixesValue() const
+            {
+                return false;
+            }
+
+
         // Mapping functions
 
             //- Map (and resize as needed) from self given a mapping object

src/thermophysicalModels/basic/derivedFvPatchFields/mixedEnergy/mixedEnergyFvPatchScalarField.H

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2011-2016 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2011-2017 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -127,6 +127,15 @@ public:
 
     // Member functions
 
+        // Access
+
+            //- Allow manipulation of the boundary values
+            virtual bool fixesValue() const
+            {
+                return false;
+            }
+
+
         // Evaluation functions
 
             //- Update the coefficients associated with the patch field