Bug 10600: add ability to edit new authority record by duplicating existing one

Bug 10600: add ability to edit new authority record by duplicating existing one

This patch adds simple link that allows one to duplicate an existing
authority.

Test plan:
1/ Go to a detail authority page
2/ Click to the "Duplicate" button
3/ Edit some fields
4/ Save
5/ The new authority is created from the existing one.

Signed-off-by: Nicole C. Engard <nengard@bywatersolutions.com>
tests pass

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
All tests pass. Template change only.
Also compared the original with the duplicated authoritiy
in MARCXML - no unwanted differences found.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>