SIFTS map uniprot resnum to PDB function fix #52
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This MR fixes the function
pdb.map_uniprot_resnum_to_pdb.Previously it read chains with the assumption that chain A == entity A.
If chains IDs in the PDB start later in the alphabet, this caused issues (i.e. PDB ID: 1atp chain I)
Now the code reads unique chains in the SIFTs file.
And then loops through them alphabetically. so that the first chain -> A, second -> B. etc.
This is a precursor to my open issue (#51). I hope its useful.
The tests pass, but I have not fixed the existing broken test in the same file (
test_download_biomol)