We were doing some silly things here with an "ORDER BY Name, CategoryID"
clause, due to the fact that Name is unique, and thus any additional
ordering after Name will have no effect. Of course, the dumb as a box of
rocks MySQL query optimizer doesn't realize this, leading to full table
scans every time of ~30000 packages instead of using index scans for the
ordering and only retrieving the first 50 rows.

The biggest change is noted in the default sort order as it cuts down
the columns to one, but we can remove the redundant sort from other
orderings as well, even though those will still not be able to use an
index-driven query plan.

Signed-off-by: Dan McGee <dan@archlinux.org>
Signed-off-by: Lukas Fleischer <archlinux@cryptocrack.de>