ENH: improve consistency in handling of global IOobjects (#3045)

- replace typeGlobal() global function with is_globalIOobject
  traits for more consistent and easier overriding.

- relocate typeFilePath() global function as a member of IOobject
  for consistency with typeHeaderOk.

BUG: faSchemes, fvSchemes not marked as global file types

- caused issues with collated

src/parallel/distributed/distributedTriSurfaceMesh/distributedTriSurfaceMesh.H

@@ -602,12 +602,11 @@ public:
 };
 
 
-//- Template function for obtaining global status
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+//- Global file type for distributedTriSurfaceMesh
 template<>
-inline bool typeGlobal<distributedTriSurfaceMesh>()
-{
-    return false;
-}
+struct is_globalIOobject<distributedTriSurfaceMesh> : std::true_type {};
 
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //