Generalized stack selection in pdb reader

mrdna/readers/segmentmodel_from_pdb.py

@@ -25,7 +25,7 @@ complement = dict(A='T', C='G', T='A', G='C')
 refUnis = {b:mda.Universe(get_resource_path("generate-nts/1-w3dna/{}{}.pdb".format(b,complement[b])))
            for b in bases}
 
-stack_text = "not name O5' P O1P O2P OP1 OP2 O3' H*"
+stack_text = "not name O5' P O1P O2P OP1 OP2 O3' 1H* 2H* 3H* 0H* H*"
 ref_name_ids_inv = dict()
 for key,val in refUnis.items():
     ref_res = val.residues[0]