Update to CQL 2.0 as of Feb 2011

Add all remaining relation symbols. Get rid of QUOTED_URI_STRING and
make it a terminal instead based on QUITED_STRING. If not, the grammar
is seriously broken, ie, search terms like "http://www.indexdata.com/"
would be forbidden. Note that the search_term now (as for CQL 1.X)
allows terms like 'and', 'or', 'sortby' .