ilastik/applets/nanshe/preprocessing/opNanshePreprocessData.py: Added CacheOutput as a slot taking output from the OpArrayCache. Output now draws from the last cached operator.
ilastik/applets/nanshe/preprocessing/opNanshePreprocessing.py: Added the slot CacheOutput, which forwards CacheOutput from opNanshePreprocessDataCached.
ilastik/applets/nanshe/preprocessing/nanshePreprocessingSerializer.py: Serialize results using the CacheOutput slot.
ilastik/workflows/nanshe/nansheWorkflow.py: Use the results from the CacheOutput slot as input for dictionary learning.
WIP