relax SVN archive

These are:
structure.create_vector_dist
structure.create_diff_tensor_pdb

The wizard graphics are taken from my paper:

d'Auvergne, E. J. and Gooley, P. R. (2008). Optimisation of NMR dynamic models II. A new methodology
for the dual optimisation of the model-free parameters and the Brownian rotational diffusion tensor.
J. Biomol. NMR, 40(2), 121-133. (http://dx.doi.org/10.1007/s10858-007-9213-3).