Bug 14734: Enhance 264 display in OPAC and Staff XSLT.

Bug 14734: Enhance 264 display in OPAC and Staff XSLT.

Makes 264 repeatable, prefer 264 over 260. If 264/ind1=3 is present in the
record the xslt uses ind1 to determine latest 264, if no ind1=3 then all
264 fields are displayed.

Test Plan:
1) Apply this patch
2) Ensure you are using the default XSLT setting for the staff and opac record details
3) Find or create a record with multiple MARC tags 264
4) Perform a search that would show the record in the search results.
5) Review results for correct 264 display.
6) Click title to review record details.

Signed-off-by: Hector Castro <hector.hecaxmmx@gmail.com>
Works as advertised. 260 not showed when 264 exists, tested with multiple
records. If ind1=3 is present shows the current/latest data

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>