Upload program requires -a to add to an existing domain.
Change to use reference points instead of cluster IDs.
Upload and cluster option -i to set initial index should actually work now.
Reference points instead of clusters.

The clustering algorithm is still used to produce cluster centres as reference points, but this is a lot simpler.
Small readme fix.
Fixed querydb to work with the new query handling system.

This should have been done with a previous commit but was neglected (by me).
Backend support for current countries and persons; default frontend facets for these fields; removed default separate arg0 and arg1 facets.
Default backend fields to prime match default frontend facets.