(bug #1578) Add the (quasi)full COinS(Zotero) support

(bug #1578) Add the (quasi)full COinS(Zotero) support

this patch do a lot of things :
 * Add the function GetCOinSBiblio in C4::Biblio, return the COinS value that must be put in a span title
   This will be usefull for OpenURL support.

 * Replace the span in opac-detail, and put the var get from GetCOinSBiblio
 * Fix an <img> tag that wasn't autoclosed
 * Add the COinS in search result
 * Full COinS support of UNIMARC, the MARC21 support should be improved to provide all kind of document types

Signed-off-by: Henri-Damien LAURENT <henridamien@koha-fr.org>