"Save to your lists" action for unauthenticated users

[phette23]

• [x] write report to see how many reports each patron category has made
• [x] opac-detail.pl: add sidebar link "Save to your lists"
  • copy HTML & icon from signed in state so they look the same
  • onclick store biblionumber & some sort of "save to lists" action code
  • then redirect to opac-user.pl so user can sign in
• [x] opac-user.pl: if we have this stored data, redirect to opac-detail.pl bib record
• [x] opac-detail.pl: check if we have stored data, if so click "Save to my lists"