Make packages view much more efficient

The len() call was killing performance, especially in the default click-thru
case where we show the packages list without any filtering (only sorting).
Also use a well-placed select_related() to further drop the query count. As
noted by the TODO, there is still more that can be done here to improve
performance.

Signed-off-by: Dan McGee <dan@archlinux.org>

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