LP1904788 Staff catalog browse results paging

LP1904788 Staff catalog browse results paging

Adds the ability to step through browse headings directly from the
heading record list page without having to return to the original browse
search

To test:

1. Navigate to the staff catalog and perform a Browse search.

2. Click on one of the headings and you'll be taken to the page which
lists the bib records that use the selected heading.

3. Click the Previous Headings and Next Headings buttons to load
the prev/next heading and its linked records.

Signed-off-by: Bill Erickson <berickxx@gmail.com>