PostprocessData update

Modifications on fieldsDataBase to work both during simulation and post-simulation
Some bug fixes and changes to the code based
Correction for region volume

src/PostprocessData/postprocessComponent/PostprocessComponent/PostprocessComponent.hpp

@@ -51,6 +51,8 @@ private:
     /// Method for processing the selected particles data 
     std::vector<ProcessMethodType>  regionsProcessMethod_;
 
+    regionField<real>               volumeFactor_;
+
     bool    executed_{false};
 
     dictionaryList                  operationDicts_;
@@ -62,6 +64,16 @@ protected:
         return regionsProcessMethod_;
     }
 
+    regionField<real>& volumeFactor()
+    {
+        return volumeFactor_;
+    }
+    
+    const regionField<real>& volumeFactor()const
+    {
+        return volumeFactor_;
+    }
+
 public:
 
     // type info