activated benchmark for Virtuoso (#51)
display error instead of aborting; this should give a full picture of the problematic triples (#51)
used query labels as key to simplify access (#51)
implemented variable assignment extraction (#51)
changed some queries: there are no results for the original ones (#51)
added methods for the benchmarked queries (#51)
added code to execute the queries (#51)
added error handling (#51)
cached query definitions (#51)
increased number of query executions (#51)
select data from dbpedia graph; it is not guaranteed that every store uses it as default graph (#51)
limit the result size of the query as Virtuoso complains otherwise (DBpedia results are also restricted in size) (#51)
added code to display errors (#51)
increased number of query executions (#51)