Sort search filter group entries by 'pos'

Sort search filter group entries by 'pos'

We use a fleshed cstore call to grab search filter groups and their entries,
but we don't currently sort them by their 'pos' field, which is it's purpose.
cstore will apply order_by expressions to the applicable tables in a fleshed
search/retrieve. This does that.

Signed-off-by: Mike Rylander <mrylander@gmail.com>
Signed-off-by: Bill Erickson <berick@esilibrary.com>