Mesh: remove problematic method MeshGrid::Rebuild(unsigned long, unsigned long)

and MeshGrid::CalculateGridLength(unsigned long, unsigned long)

For almost flat meshes CalculateGridLength may compute a grid with a huge amount of cells that allocates the whole RAM of the system while for an exactly flat mesh a grid with a sensible number of cells is computed.

Use the overloaded methods of MeshGrid::Rebuild(unsigned long) and MeshGrid::CalculateGridLength(unsigned long) instead

src/Mod/Inspection/App/InspectionFeature.cpp

@@ -177,11 +177,6 @@ public:
     }
 
 protected:
-    void CalculateGridLength(unsigned long /*ulCtGrid*/, unsigned long /*ulMaxGrids*/) override
-    {
-        // do nothing
-    }
-
     void CalculateGridLength(int /*iCtGridPerAxis*/) override
     {
         // do nothing