Corrected a few errors in the manual concerning the diffusion_tensor.init() function.
Some wrong 'param_types' were given in the examples.
This was pointed in a post by Sebastien morin at:
https://mail.gna.org/public/relax-devel/2008-02/msg00004.html (Message-id:
<47AC8138.9050703@...>)
........
