ilastik/applets/nanshe/preprocessing: Created module and moved all files related to preprocessing to it.
tests/nanshe/preprocessing/: Created module and moved all files related to testing preprocessing to it.
ilastik/applets/nanshe/dictionaryLearning/opNansheGenerateDictionary.py: Added the module opNansheGenerateDictionary to provide an operator that wraps generate_dictionary.
ilastik/applets/nanshe/dictionaryLearning/opNansheGenerateDictionary.py: Provided operator wrapper for generate_dictionary from nanshe.advanced_image_processing.