Wrapper for clustering step which accepts recetox-aplcms and XCMS output

[hechth]

The clustering step works with data from aplcms in principle, we just need to reformat the input. It would be cool to have a small workflow for this or to cover this eventually in the Galaxy training for ipa2 so that users know which steps they need to perform if they used XCMS or recetox-aplcms for peak picking.

[hechth]

This is basically solved and needs to be reviewed.