relax SVN archive

The model-free grid search args are now passed into the minimise() method.

These will later be passed into the grid search configuration functions.

Split up the grid search function, reverting back to the structure as in the 1.2 line.

Shifted all the setting up of data for model-free minimisation into its own function.

Shifted the grid search limits, diagonal scaling, and grid size test into new separate methods.

Whoops, removal of the old code which was shifted into a new function in r5170.

The diffusion tensor grid search configuration has been shifted into its own function.

Started the break up of the insanely complex model-free minimisation methods in specific_fns.

The configuration of the spin specific part of the grid search has been shifted into its own
function.

Better epydoc support for the equations and title of the unit_axes() function.

Better epydoc support for the equations of the fold_angles() function.

Replaced all '@return type:' with '@rtype:'.