- 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

The `directory` directive touches an empty file within the directory.
This causes WIsH to iterate over that file and messes its output. It
contains an empty string as contig and contains an empty phage entry
with a random taxonomy assignment. By making it a parameter for the
rules the dir only contains fasta files.