Add descriptive names to group and submitter lists

Review Request #185 — Created Dec. 6, 2007 and submitted — Latest diff uploaded

Review Board SVN (deprecated)
This change adds a description column to the groups list and a full-name column to the submitters list.

Also, IE wasn't obeying the "white-space: nowrap" style on the table headings (esp. Pending Reviews), but the widths as I've tweaked them now seem to work better.
Tried it on IE6&7 and Firefox, and made sure that the column widths and the contents looked reasonable.