Issue copied from: rcsb/mmtf#30

The ordering of assembly subunits seems to be different in MMTF and mmCIF files. This was reported on the pymol-users mailing list (https://sourceforge.net/p/pymol/mailman/message/36005513/).

I'm not aware that assembly ordering would be part of any spec, so technically there is nothing wrong here. But for consistency, it would be nice to provide identical assembly descriptions. In PyMOL, assemblies from mmCIF files are identical to pdb1 files, so I assume we're reading the mmCIF files correct.

Example: Assembly ordering for 3bw1:
mmCIF: 1 2 3 4
MMTF: 4 2 1 3