Bug 13642 - Adding new features for Dublin Core metadata

 Bug 13642 - Adding new features for Dublin Core metadata

When Koha export a bibliographic record to DC, makes it in XML format.
This XML not follows the DC-XML recommendations as should be: elements
in uppercase eg. dc:Date, dc:Creator, section 4.2, recommendation 4
explain that "The property names for the 15 DC elements should be all
lower-case." eg. dc:date, dc:creator" and section "4.3 Example - a
simple DC record", xsi:schemaLocation="http://example.org/myapp/
http://example.org/myapp/schema.xsd" schema does not exist.

NOTE: This new feature implement the XSLT transformation for OAI-DC,
SRW-DC and RDF-DC

Test plan
---------------
1) Download Dublin Core file from record detail page. Open up the file,
   and make sure that the document not follows the DC-XML
   recommendations as should be.
2) Apply patch.
3) Go to whichever bib record in OPAC or staff and click on Save >
   Dublin Core.  A modal will display, prove all options.
4) Change the system preference 'Opac ExportOptions' by enabling and
   disabling Dublin Core and try to download a record.
5) Try several bibliographic records in any format (book, magazine, DVD,
   etc.) to confirm that properly exported.
6) Test with all marc flavours.

Sponsored-by: Universidad de El Salvador
Signed-off-by: Frederic Demians <f.demians@tamil.fr>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>