Metadata elements dynamically created from XSLT normalization output.

Metadata elements dynamically created from XSLT normalization output.
Configure file controls merging and termlist extraction. Merge criteria
supported: all-fields, longest (strlen), unique. Configure also
controls which fields are included in overview format (full view not
yet implemented).
Protocol change: Metadata field names now prefixed by 'md-' in the
webservice protocol (i.e. md-title). Implemented in test1 prototype.
Todo: Date range normalization/merge, sortkey extraction, full record view.