the #GKeyFile to retrieve the page_setup from
the name of the group in the key_file to read, or %NULL to use the default name “Page Setup”
Return: the restored #GtkPageSetup
GException on failure. ConstructionException GTK+ fails to create the object.
2.12
Reads the page setup from the group @group_name in the key file @key_file. Returns a new #GtkPageSetup object with the restored page setup, or %NULL if an error occurred.