[arch-general] One more tiny patch that should bring a massive performance boost :D

Hello, During the recent libpng/libjpeg rebuilds, one thing that I noticed is that (big) Todo lists are really slow to load. Turns out that the current code is doing tons of simple queries (4 per package) which, although are quick to execute on the database server, take a considerable ammount of time to make. Thankfully, Django provides a mechanism to fetch all needed data in one go, which proved to be much faster during my testing. :) (If I should be sending these to a developer instead of this mailing list, please let me know.)