Add a timeout to the live search

- Wait until user finishes typing before suggesting new items.
Completed the basic query builder

- For the 'relation some term' query in the ricordo-refui package.
Make the tests actually work, again.
Improvement on RDF querying

- Not relying on another indirection through the Tomcat server for the
  RDF that we can directly access.
- Customized the provided RDF queries to support query across all
  available graphs in the RDF store plus return the url of the graph
  containing the desired data.
- Dropped the support for URI replacement since not the entire set of
  grammar used in the Manchester query is adapted to that style.