[daisy] Fulltext search enhancements

[Bruno Dumon]

Also in Daisy 2.0, there are now some important enhancements to the full
text search (implemented by Paul, I'm just writing this since he seems
to have forgotten it ;-) ):

 * it is possible to retrieve relevant fragments from the found
documents, with matching query words highlighted. This is simply done
using a function in query language, taking as a parameter the number of
fragments you want to retrieve.

 * the score of the fulltext search is now accessible via an identifier
in the query language

 * it is possible to retrieve chunks from query results (to show
paginated results, was previously only available for the faceted search)

 * the fulltext search page in the wiki has been enhanced to make use of
these new features

 * upgraded the Lucene engine to version 2.0

 * the problem with the "too many open files" mentioned recently on this
list is also solved (and this also in the 1.5 branch)

For people working on svn trunk: these changes mean you'll have to
rebuild your fulltext index: delete the content of the indexstore
directory and trigger rebuilding via the JMX console.

While I'm at it, another (unrelated) change (which was needed for the
import/export tools): using the remote Java API no longer requires that
you have a user with the Administrator role (for the "cache user"),
which is also a rather important improvement.

-- 
Bruno Dumon                             http://outerthought.org/
Outerthought - Open Source, Java & XML Competence Support Center
bruno at outerthought.org                          bruno at apache.org