Bug 13623: Enhance html for holds queue viewer

Bug 13623: Enhance html for holds queue viewer

It would be very helpful from a css/scripting point of view if the
author field in the holds queue report had a selectable class. In
edition, it would be great if the biblionumber were easy to grab from a
hidden div.

Test Plan:
1) Apply this patch
2) Load the holds queue report ( view_holdsqueue.pl )
3) Inspect an author name with your web browser ( or view the html )
   a) Note the hq-author class of the wrapping div
   b) Note the hidden hq-biblionumber div

HTML appears as expected.
Signed-off-by: Marc Véron <veron@veron.ch>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>