relax SVN archive

The parameter object now registers the grid bounds and scaling factors for all of the curve-fitting
parameters. This includes three functions i_scaling(), i0() and iinf() in the
specific_analyses.relax_fit.parameter_object module for calculating some of these values.

The specific_analyses.relax_fit.parameters.assemble_scaling_matrix() function has been deleted as
this is now provided by the upstream code in pipe_control.minimise. And the API methods
grid_search() and minimise() has been modified to accept the list of scaling matrices.

As the grid bounds and increments are now handled by the upstream pipe_control.minimise.grid_setup()
function, the specific_analyses.relax_fit.optimisation.grid_search_setup() function was redundant
and was deleted.