Adds code to opac and staff detail XSLT in order to show 776$t (or $a) and
a link based on 776$w (record control number). $w should be in the form:
For instance: (NL-AmRIJ)12345
Note: You should have enabled default opac/intranet XSLT view.
 Add two 776s (one with $t and $w and one with $t only)
 Verify that you see "Additional physical formats" on opac-detail. Does
the link for $w work?
 Check intranet detail too.
 Empty 776$t and put text in $a. Check detail page again.