workspace 6.x-1.0

The workspace module has been rewritten for Drupal 6. The core functionality remains the same: it simply shows you lists of content. New features:

- inspired by kmillecam's work on #232031, I've broken the lists into Content, Comments, and Attachments. This should help with performance and gets rid of the giant UNION query.

- more permissions. Now users can view each others' workspaces with the 'view all workspaces' permission.

Other changes:

- dropped support for the obsolete nodeperm_role and flexinode modules.

This is a 1.0 release, which means it is probably full of bugs. Please report any you find in the issue queue.