Extend to phenograph

[mbuttner]

Phenograph offers a number of different functions designed for cytometry data, such as clustering and batch correction in Python. A wrapper for Phenograph functions would complement the pytometry package.

[burtonrj]

There is also PARC clustering which is a slightly optimised version of phonograph: https://academic.oup.com/bioinformatics/article/36/9/2778/5714737

I ported it here in cytocluster: https://github.com/burtonrj/CytoCluster/blob/main/cytocluster/methods/parc.py

Phenograph should be priority but maybe afterwards its worth thinking about PARC

[mbuttner]

Thanks for bringing this up! I agree that Phenograph should be prioritized.