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/multiphase/reactingTwoPhaseEulerFoam/laminar/steamInjection/system/controlDict

@@ -59,8 +59,11 @@ functions
         type            setTimeStep;
         libs            (utilityFunctionObjects);
         enabled         yes;
-        deltaT          tableFile;
-        file            "<system>/deltaTvalues";
+        deltaT
+        {
+            type table;
+            file "<system>/deltaTvalues";
+        }
     }
 
     minMaxp