changed the way how the table name is set in a Model - added prepare_table() method

removed from Model:
virtual void table_name(PT::TextStream & stream);

added to Model:
virtual void prepare_table();
virtual void table(const wchar_t * table_name);
virtual void table(const wchar_t * schema_name, const wchar_t * table_name);

samples/type.h

@@ -70,11 +70,9 @@ public:
 		field(L"name", name);
 	}
 
-
-	void table_name(PT::TextStream & stream)
+	void prepare_table()
 	{
-		// schema.table_name or just table_name
-		stream << "public.types";
+		table(L"public", L"types");
 	}
 
 	void after_insert()