Fixes to the 'Tasks per user' form. Assignment changes now work properly.
Fixes for making the 'Tasks' page compatible with the new task assignment
code in 'do_task_assign_aed'. Now task assignment works properly.
Clean of some module's configs
Several fixes for the 'Files' module:

- Bulk moving and assigning now works
- A file with several versions now shows the latest version information as
  the parent
- Several redirects after operations now work properly
- A file's versions are now shown in order