solvers: Moved createRDeltaT.H into createFields.H so that it is available with the -postProcess option

Required to support LTS with the -postProcess option with sub-models dependent on ddt
terms during construction, in particular reactingTwoPhaseEulerFoam.

applications/solvers/compressible/rhoCentralFoam/createFields.H

@@ -1,3 +1,5 @@
+#include "createRDeltaT.H"
+
 Info<< "Reading thermophysical properties\n" << endl;
 
 autoPtr<psiThermo> pThermo

applications/solvers/compressible/rhoCentralFoam/rhoCentralDyMFoam/rhoCentralDyMFoam.C

@@ -36,6 +36,8 @@ Description
 #include "turbulentFluidThermoModel.H"
 #include "fixedRhoFvPatchScalarField.H"
 #include "directionInterpolate.H"
+#include "localEulerDdtScheme.H"
+#include "fvcSmooth.H"
 #include "motionSolver.H"
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

applications/solvers/compressible/rhoCentralFoam/rhoCentralFoam.C

@@ -51,7 +51,6 @@ int main(int argc, char *argv[])
     #include "createFields.H"
     #include "createFieldRefs.H"
     #include "createTimeControls.H"
-    #include "createRDeltaT.H"
 
     turbulence->validate();
 

applications/solvers/compressible/rhoPimpleFoam/createFields.H

@@ -1,3 +1,5 @@
+#include "createRDeltaT.H"
+
 Info<< "Reading thermophysical properties\n" << endl;
 
 autoPtr<psiThermo> pThermo

applications/solvers/compressible/rhoPimpleFoam/rhoPimpleDyMFoam/rhoPimpleDyMFoam.C

@@ -57,7 +57,6 @@ int main(int argc, char *argv[])
     #include "createTime.H"
     #include "createDynamicFvMesh.H"
     #include "createControl.H"
-    #include "createRDeltaT.H"
     #include "initContinuityErrs.H"
     #include "createFields.H"
     #include "createFieldRefs.H"

applications/solvers/compressible/rhoPimpleFoam/rhoPimpleFoam.C

@@ -53,7 +53,6 @@ int main(int argc, char *argv[])
     #include "createMesh.H"
     #include "createControl.H"
     #include "createTimeControls.H"
-    #include "createRDeltaT.H"
     #include "initContinuityErrs.H"
     #include "createFields.H"
     #include "createFieldRefs.H"