Bug 14306: Show URL from MARC21 field 555$u under Title Notes/Descriptions

 Bug 14306: Show URL from MARC21 field 555$u under Title Notes/Descriptions

This patch includes:
[1] Add some logic to GetMarcNotes to embed the contents of MARC21 field
    555$u in a html anchor tag.
[2] Add a unit test for GetMarcNotes in Biblio.t
[3] Remove calls to GetMarcNotes from sendbasket.pl (opac and staff).
    A closer look revealed that the data was not used; the notes in the
    mail of sendbasket are taken from GetBiblioData.

Test plan:
[1] Edit a record. Add one or two URLS in 555$u. Add something in 500$a too.
[2] Check if you can click the URLs in opac and staff detail tab Notes or
    Descriptions.
[3] Run the unit test t/db../Biblio.t
[4] Add something in the cart. Click More Details and send the cart.
    Verify that you have something in Notes (from 500$a).

Signed-off-by: Marc Veron <veron@veron.ch>
Followed test plan. Works as expected. QA tools OK.

Tested with all patches together, works as expected
Signed-off-by: Marc Véron <veron@veron.ch>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>