Bug 12501: Show dissertation note (MARC21 502) in XSLT results

Bug 12501: Show dissertation note (MARC21 502) in XSLT results

Bug 9356 added the dissertation note from MARC21 502 to the staff
and OPAC detail pages. This patch adds it to the result list.

1) Catalog a record with 502
   Examples: http://www.loc.gov/marc/bibliographic/bd502.html
2) Important: Wait until the record got indexed by Zebra or
   index it manually.
3) Verify your note shows up on the detail pages in staff and OPAC
4) Verfiy note also shows up on the result pages in staff and OPAC

5) Hide the dissertation note from display:

OpacUserCSS:
.diss_note {
  display:none;
}

IntranetUserCSS:
.diss_note {
  display:none;
}

6) Verify CSS works and all looks like before...

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Work as describes, value can be hidden using css,
no koha-qa errors

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>