add conserved quantity to statWriter fix bug of vector wrapping at NPTi
added resetTime to the Global namespace. added ability to reset the integrators in the NVT and NPT family.
Added Z constraint.
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Fixes for get and set routines in Atom and DirectionalAtom
Fixes to NVT. Check them!
Most of the integrator and NVT seem to be working now.
NVT additions
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