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Molecular dynamics by NMR data analysis

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Shifted some of the pipe_control.diffusion_tensor functions to lib.diffusion.main.

Authored by: bugman 2013-03-26

changed	/trunk/lib/diffusion/__init__.py
changed	/trunk/pipe_control/diffusion_tensor.py
copied	/trunk/pipe_control/diffusion_tensor.py -> /trunk/lib/diffusion/main.py

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