Added typeName function to PgObject as it might be useful for building generic functions.

pglablib/catalog/PgNamespace.cpp

@@ -6,3 +6,8 @@ bool PgNamespace::isSystemCatalog() const
 	return n.startsWith("pg_")
 		|| n == "information_schema";
 }
+
+QString PgNamespace::typeName() const
+{
+	return "SCHEMA";
+}