Add a CSV delimiter argument in predict_csv.py

Add --delimiter -D argument to the script to provide the CSV delimiter. It is useful as many CSV files are separated with ";" instead of ",".
Add allow_input_downcast=True

Add allow_input_downcast=True to the script. It is useful as GPU uses float32 and CSV floats are not properly typed and Python assumes float64.
Merge pull request #1272 from MarCnu/csv-allow_input_downcast

Add allow_input_downcast=True
Merge pull request #1271 from MarCnu/csv-delimiter

Add a CSV delimiter argument in predict_csv.py
fixed typo in summarize_model.py
Merge pull request #1285 from karstenBehrendt/patch-1

fixed typo in summarize_model.py
FlattenerLayer get_layer_monitoring_channels now picks apart state