thermophysicalProperties: added demo of dictionary tree lookup

tutorials/compressible/rhoPimpleFoam/les/pitzDaily/constant/thermophysicalProperties

@@ -15,15 +15,34 @@ FoamFile
 }
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
+gasThermoTypes
+{
+    constant
+    {
+        type            hePsiThermo;
+        mixture         pureMixture;
+        transport       const;
+        thermo          hConst;
+        equationOfState perfectGas;
+        specie          specie;
+        energy          sensibleEnthalpy;
+    }
+
+    janaf
+    {
+        type            hePsiThermo;
+        mixture         pureMixture;
+        transport       sutherland;
+        thermo          janaf;
+        equationOfState perfectGas;
+        specie          specie;
+        energy          sensibleEnthalpy;
+    }
+}
+
 thermoType
 {
-    type            hePsiThermo;
+    $gasThermoTypes.constant;
-    mixture         pureMixture;
-    transport       const;
-    thermo          hConst;
-    equationOfState perfectGas;
-    specie          specie;
-    energy          sensibleEnthalpy;
 }
 
 mixture