LP#1284864 TPAC format selector attribute / values

LP#1284864 TPAC format selector attribute / values

Creates a new search_format record attribute, which is responsible for
driving the catalog search format selector.  The values are derived from
the icon_format attriute, with a few notable changes (for starters).

1. The 'book' search_format contains large print and has the label "All
Books".

2. The 'music' search_format contains all music, regardless of sound
record format (or other attributes) and has the label "All Music"

Signed-off-by: Bill Erickson <berick@esilibrary.com>