Check experiment classpath for running classifiers

[larskotthoff]

I see

[WARN ] [PROCESS-ERR]  java.lang.RuntimeException: Failed to set classifier options [-S, weka.attributeSelection.GreedyStepwise, -E, weka.attributeSelection.HoldOutSubsetEvaluator, -W, weka.classifiers.trees.RandomTree, --, -M, 16, -K, 0, -depth, 19, -N, 3] for classifier weka.classifiers.meta.AttributeSelectedClassifier: Can't find class called: weka.attributeSelection.HoldOutSubsetEvaluator

in the logs sometimes. The class is there in autoweka.jar (which is in the classpath), so not sure what's causing this. Explicitly adding weka.jar to the classpath doesn't solve this.