VCS: allow NXQL to query complex properties

NXQL queries can now reference any list element or complex property (including as ORDER BY clauses, and as selected values using queryAndFetch) with the following syntax: foo/123 - the 123th element of the foo simple list foo/* - any element of the foo simple list (multiple results) foo/*5 - any element like above, but several references using the same number after * (here 5 in this example) will refer to the same value of the list foo/bar - the bar property of the foo complex property foo/123/bar - the bar property of the 123th element of the foo complex list foo/*/bar - the bar property of any element of the foo complex list foo5/*/bar - the bar property of any element like above, but several references using the same number will refer to the same element of the complex list Examples: SELECT * FROM File WHERE content/length > 0 SELECT * FROM File WHERE content/name = 'testfile.txt' SELECT * FROM File ORDER BY content/length DESC SELECT * FROM Document WHERE tst:couple/first/firstname = 'Steve' SELECT * FROM Document WHERE tst:friends/0/firstname = 'John' SELECT * FROM Document WHERE tst:friends/*/firstname = 'John' SELECT * FROM Document WHERE tst:friends/*1/firstname = 'John' AND tst:friends/*1/lastname = 'Smith' SELECT tst:friends/*1/lastname FROM Document WHERE tst:friends/*1/firstname = 'John' SELECT * FROM Document WHERE dc:subjects/0 = 'something' SELECT * FROM Document WHERE dc:subjects/* = 'something' SELECT dc:subjects/*1 FROM Document WHERE dc:subjects/*1 LIKE 'abc%'