Bug 24415: Authority enhancement - Improve access to tabs

Bug 24415: Authority enhancement - Improve access to tabs

This patch makes style changes to the authority record editor in order
to make it easier to navigate among tabs and tags. This change matches
the one made to the basic MARC editor in Bug 22045.

Tabs are now part of the page's toolbar, which floats as the page
scrolls. In addition to the numbered tabs, there is also a section
showing in-page links to the MARC tags which are available on that page.

To test, apply the patch and clear your browser cache if necessary.

Open a blank or existing record in the authority record editor. Test
the redesigned tabs, the floating toolbar, and the in-page tag links.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>