Implements FS#20416. Port over the architecture differences view from
archlinux.de and reimplement in Django with our DB schema. Also use a far
simpler SQL query to do the dirty work rather than the triple UNION
operation. This is accomplished by doing a bit more of the fetching work in
code once we know what packages are actually involved.
Signed-off-by: Dan McGee <dan@archlinux.org>
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