#29 topics.php needs sort

[Tim Riker]

Tables in topics.php should have the headers as links.
Clicking a header like "last edit" would sort the table
by edit date. Clicking a second time would reverse sort
by the same field. The sort key should be a parameter
that can be passed in the URL. This means that
changes.php can be removed. The URL:

http://TuxScreen.net/wiki/changes.php

becomes:

http://TuxScreen.net/wiki/topics.php?sort=ddate

where sort choices would be like adate or ddate for
accending by date or decending by date.

All fields would be sortable so one could see topics
sorted by most often viewed, etc.

I would suggest that the different "web" tables be
combined and that "web" be added as a field.

Any sort key probably implies a trailing atopic sort as
secondary key.

If you want to get carried away do multiple field
sorting like sort=aweb,ddate and so on. ;-) These would
not need to be handled by the sort buttons, just by
hardcoded URLs. Of course if you can think of a way to
do it, go for it. ;-)