Adapt/provide a script to perform plausible/implausible filtering

[jhlegarreta]

Some people might want to perform only plausible vs. implausible streamline filtering, and later use a bundling strategy (definition, atlas, etc.) that is different from the one we have made available.

Should also be documented.

This should also be made available in the Nextflow pipeline, so the bundling and the generative parts should be optional.