Bug 15162 Add for Unimarc XSL trans for RDF-DC & SRW-DC

 Bug 15162 Add for Unimarc XSL trans for RDF-DC & SRW-DC

Fix also, marginaly, OAI-DC XSL file which were using 090$a as biblionumber
rather than 001.

To test with an Unimarc Catalog:

- Open this URL

  /cgi-bin/koha/unapi?id=koha:biblionumber:41201&format=marcxml

  And play with id & format parameters
  Test format=rdfdc and format=srw_dc

- Or try with bug 13642

Signed-off-by: Hector Castro <hector.hecaxmmx@gmail.com>
Works as advertised. Both XML formats generated successfully. Also fix
problem with OPACBaseURL in UNIMARC environment. Tested with Sandbox too.

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>