Make Workench Access compatible with Panels

Hi,

I'm using Panels on my site and found no way to expose the workbench access field in my node forms, so I created a simple ctools plugin that takes the node_form as the context and exposes the workbench access field on the form. I'm just wondering if it's any useful for you. Including it in the module is probably not the best idea because it adds a dependency towards ctools, but at the same time it could be useful for sites that make extensive use of panels.

I've got the code if you need it, let me know.

Rob