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Molecular dynamics by NMR data analysis

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Spun out the maths_fns.rotation_matrix.random_rot_axis() function into its own module.

The function is now called maths_fns.vectors.random_unit_vector().

Authored by: bugman 2013-01-10

changed	/trunk/maths_fns/__init__.py
changed	/trunk/maths_fns/rotation_matrix.py
copied	/trunk/maths_fns/rotation_matrix.py -> /trunk/maths_fns/vectors.py

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