Add multicolumn indexes on votes and notifications tables

To put a long story short, when we do joins on these tables in our
pkg_search_page() function, we always join on both the user ID and package
ID columns. By creating multicolumn indices, we can always get the exact row
we are looking for in the table.

The benefits of adding a unique index should also speak for themselves, as
we previously did not have this on either of these tables.

This is part one of a two-part series to address the fact that this query
was often showing up in our slow query logs.

Signed-off-by: Dan McGee <dan@archlinux.org>
Signed-off-by: Loui Chang <louipc.ist@gmail.com>

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