MODE-1873 Corrected how subquery results are converted to criteria 

When a subquery selected a pseudo-column (like 'jcr:path'), the query result contained Path instances. These values could not be successfully used in criteria, since they were not converted to the correct value type expected in the dependent query. Since only pseudo-columns were a problem (and really only the 'jcr:path' and 'jcr:name' pseud-columns since they return Path and Name values, respectively), the code that grabs the subquery results was modified to convert these non-standard types to strings.
    
A test case was added to the text sequencer test case, since that was the best place for replicating the problem query (which used the 'mode:derivedFrom' property created during the sequencing operation). However, once the problem was identified, I created a simple test case within the JcrQueryManagerTests.