Added test for all drugs database (Zdd) from ZINC.
Removed temporary files that should not have been checked in.
Rough draft of testing of all drugs (using OEChem) seems to run, but finds differences in ffxml- and AmberPrmtopFile-based systems.
Removed unwanted files.
Removed unwanted files.
Removed duplicates.
Merge pull request #3 from jchodera/alldrugs

Added test for all drugs database (Zdd) from ZINC.  Test currently reveals some possible issues.