ENH: consistent UniformDimensionedField naming

- construct from components, or use word::null to ensure
  consistent avoid naming between IOobject vs dimensioned type.

- support construct with parameter ordering as per DimensionedField

ENH: instantiate a uniformDimensionedLabelField

- eg, for registering standalone integer counters

applications/solvers/heatTransfer/chtMultiRegionFoam/chtMultiRegionSimpleFoam/fluid/createFluidFields.H

@@ -108,7 +108,7 @@ forAll(fluidRegions, i)
                 IOobject::READ_IF_PRESENT,
                 IOobject::NO_WRITE
             ),
-            dimensionedScalar("hRef", dimLength, Zero) // uses name
+            dimensionedScalar(word::null, dimLength, Zero)
         )
     );
 

applications/solvers/heatTransfer/chtMultiRegionFoam/chtMultiRegionTwoPhaseEulerFoam/fluid/createFluidFields.H

@@ -221,7 +221,7 @@ forAll(fluidRegions, i)
                 IOobject::READ_IF_PRESENT,
                 IOobject::NO_WRITE
             ),
-            dimensionedScalar("hRef", dimLength, Zero)
+            dimensionedScalar(word::null, dimLength, Zero)
         )
     );
 

applications/solvers/heatTransfer/chtMultiRegionFoam/chtMultiRegionTwoPhaseEulerFoam/fluid/initContinuityErrs.H

@@ -13,11 +13,11 @@ forAll(cumulativeContErrIO, i)
                 "cumulativeContErr",
                 runTime.timeName(),
                 "uniform",
-                mesh,
+                mesh.thisDb(),
                 IOobject::READ_IF_PRESENT,
                 IOobject::AUTO_WRITE
             ),
-            dimensionedScalar(dimless, Zero)
+            dimensionedScalar(word::null, dimless, Zero)
         )
     );
 }

applications/solvers/heatTransfer/chtMultiRegionFoam/fluid/createFluidFields.H

@@ -112,7 +112,7 @@ forAll(fluidRegions, i)
                 IOobject::READ_IF_PRESENT,
                 IOobject::NO_WRITE
             ),
-            dimensionedScalar("hRef", dimLength, Zero) // uses name
+            dimensionedScalar(word::null, dimLength, Zero)
         )
     );
 

applications/solvers/heatTransfer/chtMultiRegionFoam/fluid/initContinuityErrs.H

@@ -13,11 +13,11 @@ forAll(cumulativeContErrIO, i)
                 "cumulativeContErr",
                 runTime.timeName(),
                 "uniform",
-                mesh,
+                mesh.thisDb(),
                 IOobject::READ_IF_PRESENT,
                 IOobject::AUTO_WRITE
             ),
-            dimensionedScalar(dimless, Zero)
+            dimensionedScalar(word::null, dimless, Zero)
         )
     );
 }