The following two applications of g_hash_table_foreach should probably
be changed to gnm_hash_table_foreach_ordered so we don't depend on glib's
hash ordering which can change.

Note: I tried to make the first one produce non-deterministic output, but
failed.  I think that means it at least doesn't depend on malloc addresses.

../plugins/openoffice/openoffice-write.c:       g_hash_table_foreach (state->text_colours, (GHFunc) odf_write_text_colours, state);


../plugins/openoffice/openoffice-write.c:                       g_hash_table_foreach (state->graph_fill_images, (GHFunc) odf_write_fill_images,