No output config parameter set during benchmark run

[patrickwestphal]

It seems, currently the output config option is not set by the benchmark runner resulting in errors like this in the (Prolog systems') run scripts:

Traceback (most recent call last):
  File "./run", line 284, in <module>
    output_file = cfg['output']
KeyError: 'output'

[giuseta]

The problem was in line 17 of org.aksw.mlbenchmark.systemrunner.CrossValidationStep.java. A private field was hiding an inherited field. I committed the change. I think we can consider it as resolved :-)

[patrickwestphal]

Thanks a lot @giuseta ! :)