Bug 10058 - Fix unapi for NORMARC

Bug 10058 - Fix unapi for NORMARC

This patch uses a lot of MARC21 XSLT to transform NORMARC records
to desired formats. Since NORMARC is mostly a subset of MARC21, I
think this should give passable results. And better results than
no unapi-support at all for NORMARC!

To reproduce:
- Make sure you have marcflavour = NORMARC
- Visit /cgi-bin/koha/unapi in a browser
- Observe the empty <formats></formats> element

To test:
- Apply the patch
- Visit /cgi-bin/koha/unapi in a browser
- Observe the the list of formats in the <formats></formats> element
- Import the provided sample NORMARC record and make a note of its
  biblionumber
- View the record at /cgi-bin/koha/unapi?id=koha:biblionumber:x&format=y
  where x = the biblionumber of the sample record and y = one of the
  formats marcxml, marcxml-full, mods, mods-full, mods3, mods3-full,
  oai_dc, rdfdc, rss2, rss2-full and srw_dc
- Check that the transformed records make some kind of superficial
  sense

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>