Make it possible to order NXQL fulltext search results by relevance with the keywords in the query

Most fulltext indexing implementation provide a ranking measure of the relevancy of results w.r.t. the keywords in the query. However this is not available in the NXQL query syntax.

The CMISQLQueryMaker implementation provides a SCORE() predicate that for this purpose:

SELECT SCORE() AS relevance FROM cmis:document WHERE CONTAINS('keyword') " ORDER BY relevance

The NXQLQueryMaker has to be extended to provide the same feature and should probably be used sort criterion by default in the content views for simple search text box of DM, DAM and DM "faceted" navigation views whenever the fulltext keyword field is not empty.