relax SVN archive

Created the specific API common method _data_init_spin().

This will be used as a general method for aliasing to data_init() for initialising spin parameters.

Import cleanup in the specific_analyses.relax_disp module.

The relaxation dispersion specific analysis now aliases API base methods for a number of methods.

Docstring cleanups for the specific_analyses.relax_disp module.

Alphabetical arrangement of methods in the specific_analyses.relax_disp module.

The specific_analyses.relax_disp module now uses the parameter list object to define parameters.

This allows the now unused methods data_names(), default_value(), return_data_name(), and
return_grace_string() to be deleted and their contents copied into the parameter definitions in the
class __init__() method.

Removed all aliasing of the current data pipe in specific_analyses.relax_disp as this is in __builtin__.

The relax_disp.select_model backend now handles the 'exp_fit' model.

Updated the documentation in specific_analyses.relax_disp to use the user_functions package design.

The user_functions.objects.Desc_container and user_functions.data.Uf_tables objects are now used to
construct the relaxation dispersion documentation.

Python 3 import fix for the specific_analyses.relax_disp module.