tweak to default suggestion for low-hits search

tweak to default suggestion for low-hits search

Rather than show a suggestion for every word in the
original search phrase, only display suggestions
for words not found in the dictionary.  For example,
rather than having a search for "Amesh paradise" return
a suggestion of "Amish paraders", return "Amish paradise"
as the suggestion (assuming the default dictionaries are used).

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
git-svn-id: svn://svn.open-ils.org/ILS/branches/rel_2_1@19965 dcc99617-32d9-48b4-a31d-7c20da2025e4