rna_pdb_tools.py with fetch cif files as well

[mmagnus]

(base) ➜  endo wget https://files.rcsb.org/download/1jj2.cif
--2023-09-28 19:54:13--  https://files.rcsb.org/download/1jj2.cif
Resolving files.rcsb.org (files.rcsb.org)... 128.6.159.157, 128.6.159.100, 132.249.213.241, ...
Connecting to files.rcsb.org (files.rcsb.org)|128.6.159.157|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: unspecified [application/octet-stream]
Saving to: ‘1jj2.cif’

1jj2.cif                                    [ <=>                                                                          ]  11,29M  68,3MB/s    in 0,2s

2023-09-28 19:54:14 (68,3 MB/s) - ‘1jj2.cif’ saved [11842546]