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Molecular dynamics by NMR data analysis

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The diffusion_tensor.init user function can now set initial tensor parameter values of None.

This is to allow for the new grid search preset flag. Therefore allowing the values to be None
allows for a grid search to be performed by default.

Authored by: bugman 2014-07-23

changed	/branches/zooming_grid_search/pipe_control/diffusion_tensor.py
changed	/branches/zooming_grid_search/user_functions/diffusion_tensor.py