ENH: adjustments for Function1/PatchFunction1

- additional debug information

- improve support for dictionary specification of constant, polynomial
  and table entries. These previously only worked properly for
  primitiveEntry, which causes confusion.

- extend table Function1 to include TableFile functionality.
  Simplifies switching and modifying content.

tutorials/combustion/fireFoam/LES/compartmentFire/0/U

@@ -24,10 +24,10 @@ boundaryField
     inlet
     {
         type            flowRateInletVelocity;
-        massFlowRate    tableFile;
-        massFlowRateCoeffs
+        massFlowRate
         {
-            file            "<constant>/massLossRate";
+            type table;
+            file "<constant>/massLossRate";
         }
         value           uniform (0 0 0);
     }