Extend SELECT grammer to allow selecting "path" and "score"

[dantleech]

In the shell it would be very beneficial to be able to display all the fields contained in a query result.

For example:

SELECT path(), score(), title FROM [nt:unstructured] WHERE CONTAINS(*, '*foo*';

Currently the path is shown all the time and the score cannot be accessed.

[dantleech]

JBoss does this:

When using this query language, the QueryResult always contains the "jcr:path" and "jcr:score" columns.

http://docs.jboss.org/jbossdna/0.7/manuals/reference/html/jcr-query-and-search.html#fulltext-search-expressions

[dantleech]

See also: jackalope/jackalope#240