Bug 699597 - Autocomplete using GAL is slow

Bug 699597 - Autocomplete using GAL is slow

With large addressbooks, using an inner join which produces hundreds of
thousands of duplicate results, and then filtering them back down to what
we really wanted with 'DISTINCT' is really inefficient. I can't even tell
you *how* inefficient, because it didn't complete a single query in the
hours that I left it running. Switch it to a more sensible outer join and
it completes in a second or so on my 216000-entry address book.