added the display code to the links

Basically for links primo seems to either send a $$D or a $$E.  With one or the other being required.   $$E is a code that gets translated into the actual title.    In our instance of primo many of the fulltext links are only sending the display code. 

There is more info in the technical guide. 
http://www.customercenter.exlibrisgroup.com/_layouts/Netwise/ExlibrisLogin.aspx?ReturnUrl=%2fDocumentationCenter%2f_layouts%2fAuthenticate.aspx%3fSource%3d%252fDocumentationCenter%252fEx%252520Libris%252520Documentation%252fPrimo%252fTechnical%252520Documentation%252fVersion%2525204.x%252fStaff%252520User%252520Information%252fPrimo%252520Technical%252520Guide.pdf&Source=%2fDocumentationCenter%2fEx%2520Libris%2520Documentation%2fPrimo%2fTechnical%2520Documentation%2fVersion%25204.x%2fStaff%2520User%2520Information%2fPrimo%2520Technical%2520Guide.pdf