IOobject: Added localPath and localObjectPath member functions

For many information and diagnostic messages the absolute path of the object is
not required and the local path relative to the current case is sufficient; the
new localObjectPath() member function of IOobject provides a convenient way of
printing this.

applications/utilities/surface/surfaceFeatures/surfaceFeatures.C

@@ -387,7 +387,7 @@ namespace Foam
         feMesh.writeStats(Info);
 
         Info<< nl << "Writing extendedFeatureEdgeMesh to "
-            << feMesh.objectPath() << endl;
+            << feMesh.localObjectPath() << endl;
 
         mkDir(feMesh.path());
 
@@ -420,7 +420,7 @@ namespace Foam
         );
 
         Info<< nl << "Writing featureEdgeMesh to "
-            << bfeMesh.objectPath() << endl;
+            << bfeMesh.localObjectPath() << endl;
 
         bfeMesh.regIOobject::write();