Parse HND1 etc atoms in DUD-E

Dock 3.7 receptor files contain HND1 etc atoms, to parse them correctly we need to accept HN* as a hydrogen.

Eg.
ATOM     67 HN12 ARG   419      13.144  19.110  -1.468
ATOM     68 HN11 ARG   419      14.216  18.411  -2.711
ATOM     69 HN22 ARG   419      13.007  21.429  -1.225
ATOM     70 HN21 ARG   419      13.976  22.488  -2.284