Integrating MDANCE functionality in CPPTRAJ

[ramirandaq]

We finally have C++ versions of some MDANCE functionality (NANI and HELM for now, DIVINE coming soon). Maybe this could be a good starting point to get some of these clustering methods in CPPTRAJ? This is the current repo: https://github.com/mqcomplab/CPP-MDANCE

[drroe]

This is great! I'm hoping to merge the code from here to make CPPTRAJ v7.0 (https://github.com/drroe/cpptraj/tree/prepareforleap.remote.buildatom), and after that I will try to make this a top priority. Thanks!