rewrite ID for MARC records

to give ZVDD ID rather than the ID in the original system
update Solr index names for ZVDD
ZVDD: configure the actual server URL and use extraArgs to call Solr as needed

No more need for an intermediate proxy this was, thanks to Dennis’ hint on yazlist:
http://lists.indexdata.dk/pipermail/yazlist/2013-March/003665.html