SimTk/openmm — pull request #536 by swails (2014-07-16 00:07:52+00:00)
Title: Convert AmberInpcrdFile data structures from lists to Vec3

- Some minor cleanups and simplifications in the Amber prmtop parser.
- Convert coordinates, velocities, and box vectors into Vec3 objects to avoid a
subtle bug in the units module with respect to silently modifying mutable
collections in-place when converting to a new set of units.