Add another OAI server

Add another OAI server

This OAI server has those characteristics:

   * It doesn't use C4::OAI anymore.
   * It uses HTTP::OAI library which is easily expandable.
   * XML result is not build anymore directly but using
     XML::SAX::Writer. It should solve encoding and XML related issues.
   * It returns two formats: oai_dc and marcxml.
   * DC is generated from biblioitems.marcxml by applying XSLT
     (MARC21slim2OAIDC.xsl or UNIMARCslim2OAIDC.xsl).
   * It uses the same tokens as previous OAI server (thanks Philippe
     Jaillon).
   * There is no more sets (it wasn't operational in previous version).

Add two new dependencies:

   * HTTP::OAI
   * XML::SAX::Writer
     available as a Debian package: libxml-sax-writer-perl

Signed-off-by: Galen Charlton <galen.charlton@liblime.com>
Signed-off-by: Henri-Damien LAURENT <henridamien.laurent@biblibre.com>