Tentatively add NBFIX support to ParmEd.
Fix atom type compression.
Merge branch 'master' into nbfix
Add NBFIX support to OpenMM System generator for Amber topology file parser.
This should now extend full ff14ipq support to OpenMM.
Fix a bug with the "energy" command in OpenMM when the "applayer" keyword is
specified.
First stab at supporting NBFIX through "chamber" in ParmEd.
A few fixes for nbfix in chamber action. Don't require that all atom types
specified in an NBFIX record be defined (because that may not always be the
case).
Incorporate Joe Kaus's recent improvements to the tiMerge action.
Improve warnings about existence of 10-12 parameters when writing frcmod files.
Clean up the 12-6-4 addition code.
Remove an unnecessary remake_parm.
Major performance enhancement of topology file reading. 60% reduction in time it
takes to read a single topology file (on my laptop, solv.prmtop read time
reduced from 11.36s to 4.75s)

Profilers are awesome.