Lifted z-stack assertion, made util.loop_workflow more generic e.g. for on-the-fly data conversion tasks

Lifted z-stack assertion, made util.loop_workflow more generic e.g. for on-the-fly data conversion tasks

# Conflicts:
#	extensions/chaeo/examples/transfer_labels_to_ilastik_object_classifier.py

Start online validation of autogenerated model; but need to make inference model that takes binary inputs