I forgot to mention that taking the new Beta version and just connecting it with
PostgreSQL does work! You just follow the instructions found on the old xwiki site
(
http://old.xwiki.org/xwiki/bin/view/AdminGuide/PostGres) and don't forget to import
the XAR file. You don't have to import any db's to get it to work. It is only when
you try to import from the older xwiki that it gives troubles.