Some cleanups and clarifications.
One more round of cleanups and edits.
Remove the use of the cse subdomain in the links. And fix the link for the
mailing list.
Updates work_queue_catalog for WQ2.0.

- Removed "cancel" as a state name in work queue.
- Adds workers_full to work_queue_master.
- Adds workers_full as busy in work_queue_catalog.

Still to do:

tasks_waiting in work_queue_catalog.c reports the correct number
only if each worker is running a single task.