[Elephant] Utils for input/output of data
Implemented a collection of utility functions to load select and save data for the workflow.
Modified tools/elephant/image/butterworth_filter_cli.py to make use of utils.
adds:
- utils.py, implementing the utility functions for components
- test_utils.py, contains tests defining the api
Requirements to run tests: elephant neo nixio pynwb pytest
Edited by Moritz Kern