LP#1673857: release notes

LP#1673857: release notes

Overall test plan
-----------------
[1] In Server Admnistration -> Copy Tag Types, test creating
    and modifying copy tag types.
[2] In Server Admnistration -> Copy Tags, test creating
    and modifying copy tags.
[3] In the volume/copy editor, test use of the 'Copy Tags'
    button to link or unlink tags from copies.
[4] In the volume/copy editor, test use of the 'Copy Tags'
    button to create and link new tags on the fly.
[5] In the copy buckets interface, test use of the 'Apply Tags'
    grid action to link tags to copies.
[6] In the catalog, test the copy_tag(type, search) and
    copy_tag(*, search) filters. Verify that tag visiblity
    (as controlled by the "public" flag on a copy tag) is
    respected.
[7] In the catalog, test the display of copy tags in
    the copy table on the record summary page.
[8] Test the opac.search.enable_bookplate_search library setting
    and verify that it causes a 'Digital Bookplates' search option
    to be added.

Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>
Signed-off-by: Josh Stompro <stomproj@larl.org>
Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>