Bug 10500: Improve ISBN matching when importing records

Bug 10500: Improve ISBN matching when importing records

Test Plan:
1) Catalog a record with the ISBN "0394502884 (Random House)"
2) Export the record, edit it so the ISBN is now
   "0394502884 (UnRandomHouse)"
3) Using the record import tool, import this record with matching
   on ISBN.
4) You should not find a match
5) Apply this patch
6) Run updatedatabase.pl
7) Enable the new system preference AggressiveMatchOnISBN
8) Repeat step 3
9) The tool should now find a match

Signed-off-by: Tom McMurdo <thomas.mcmurdo@state.vp.us>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>