zinc_pseudo.py and AD4Zn.dat are copied unmodified from AutoDock Vina
(https://github.com/ccsb-scripps/AutoDock-Vina, commit 3c65c0b3e6c2c1d183f6a175ecb65e3c5ba91645:
example/autodock_scripts/zinc_pseudo.py and data/AD4Zn.dat), distributed under the
Apache License 2.0 (LICENSE in this directory).

AutoDock4Zn force field: Santos-Martins D. et al., J. Chem. Inf. Model. 2014, 54, 2371-2379.
