New tool to do density-based clustering of macromolecules

[agrossfield]

Is your feature request related to a problem?

LOOS has a bunch of clustering tools, but they all use things like k-means. It would be nice to have density-based clustering available as an alternative

Describe the solution you'd like

Write a new clustering tool, or add it to one of the existing clustering tools. It ought to be a drop-in replacement, swapping dbscan for kmeans.

Describe alternatives you've considered

New tool or add to an existing tool.