Patch to fix property/class length, NULL issues, overwriting values

In an effort to solve some issues with the length of Property and Class values, as well as NULL values, I found myself extensively rewriting this module. I have it working in a production environment currently, so I am contributing the patch back.

It contains a considerable number of changes:

1) NULL values are allowed

I had to stop using drupal_write_record to make this work, some end points do return empty values.

2) Value lengths have been extended to 255 chars. 32 was not sufficient for names or descriptions.

3) I've re-factored the code to allow Options to passed from the submit form.

Currently, this allows you to:
- Force an overwrite of existing database values
- Use verbose reporting (see all changes - good for debugging)
- Switch between original value processing, and my experimental value processing

Its considerably different from 6.x-dev, and while it fixes some of the issues in the queue, it does more than that, so I've submitted it as a new issue.