Acq general search: improve searching for negative comparisons
This aims to address Launchpad bug #
1031535. I think the bug only
really shows up when searches involve invoices either as the core type
or with filter fields. If a search doesn't involve invoices, the
problematic joins aren't present.
Could use more testing though. Seems to make the problem go away, and
other basic searches seem to work, but I certainly haven't tested
everything.
Signed-off-by: Lebbeous Fogle-Weekley <lebbeous@esilibrary.com>
Signed-off-by: Dan Wells <dbw2@calvin.edu>