CreateAtomIndices.py doesn't recognize residue name CYM (deprotonated cysteine)

[sryckbos]

Tiny issue, but often cysteines are deprotonated (like when coordinating zinc in my case). In AMBER, at least, the name for these residues are CYM, but CreateAtomIndices.py just ignored them entirely when making the file.

[Serilin]

Can we define these number of atoms by ourselves? I'm a fresher and not sure.