Add some lines into global.cpp to make it work with energy minimization
added a new NPT integrator, NPTxyz. It scales the x, y, and z direction sepeartely. no box skew allowed.
Converted NPTf to work with the NPT base class. Removed NPTfm and NPTim from cvs
added NPT base class. NPTi is up to date. NPTf is not.
Added Z constraint.
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