nodeorder.install success message issue

Issue Summary

Installation/uninstallation of nodeorder reports failure, regardless of actual success or failure.

Problem is that drupal_add_field() and drupal_drop_field() return nested arrays, while the installation functions expect a single flat array.

ie: instead of

if ($ret['success'] === TRUE) { ... }

it should go something like

if ($ret[$i]['success'] === TRUE) { ... }

where $i is an integer. The attached patch iterates through the nested arrays and checks for error values.