Added anisotropic MC barostat option, allowing x, y, and z lattice vectors to change independently.
Changed the variable type of anisotropic from int to bool.
Currently in the middle of implementing new version but not finished yet.
Code implemented and passes tests
Replaced some tabs with spaces
Removed duplicate kernels, slightly modified API for Python compatibility.
Merge commit '5db397d01dcc667c296d3dca2270874cb0d333bf'
Merge branch 'master' of https://github.com/SimTk/openmm
Fixed documentation mistake (thanks Robert)
Using a const Vec3& instead of three doubles for the AnisotropicBarostat API.  Still figuring out SWIG issues.
Placed MonteCarloAnisotropicBarostat into separate files
Compiles
Merge branch 'master' of https://github.com/SimTk/openmm into vec3api
Merge branch 'master' of https://github.com/SimTk/openmm
Merge branch 'master' of https://github.com/SimTk/openmm into vec3api
Fixed Python wrapper for specifying the pressure as a Vec3
Changed gb settings to use strings rather than named constants.
Merge branch 'upstream' into fork
Revert "Changed gb settings to use strings rather than named constants."

This reverts commit 4572d2e320208bbbf8a6573daa1f977135df3fde.
Merge branch 'master' of https://github.com/SimTk/openmm