pemtk.sym
Symmetry-related functions for PEMtk and general use.
24/02/22 v1 from dev notes, mainly using libmsym on backend.
libmsym:
Manuscript: https://link.springer.com/article/10.1186/s13321-017-0193-3
Supported point groups: Ci, Cs, Cnv, Dn, Dnh, Dnd, Td, O, Oh, I and Ih
For Spherical Harmonic conversion and handling, implements pySHtools. See https://shtools.oca.eu/shtools/public/index.html