- Update vhulk with the latest image
- pass custom scripts as params to simplify rules
- skip the filtering step since now vhulk works
- remove vhulk input as dependency for all rules since it is not writing
in the input anymore

vhulk is ...buggy. Disabling it for now
- Added the cat_predictions.py that handles arbitrary number of input,
depending on the output that is there. All operations are done internally
with pandas. I replaces the hard coded bash scriplet that assumed all tools
had run

This reverts commit 0c51f51b.