relax SVN archive

Removed a number of specific API methods from the model-free analysis.

These are now provided by the base class.

Large reworking of the specific analysis API.

Many specific methods relating to parameters have been shifted into the API base class. These
include:
- data_names(),
- data_type(),
- default_value(),
- return_conversion_factor(),
- return_data_desc(),
- return_data_name(),
- return_grace_string(),
- return_units().

These are now essentially provided by the parameter list object.

All of the global and spin parameter lists have now also been merged into the single 'self.PARAMS'
structure.

The py_type is now set for the minimisation parameters.

Fixes for the specific API param list object.

The add() method now checks that the py_type is given, and the 'select' and 'fix' parameters are now
correctly added.

Renamed 'param_set' to 'set' in the specific API param list object.

Split the specific API param obj loop() method into two.

The new base_loop() method loops over the parameter names according to set, whereas the loop()
method now supports and returns the error and simulation parameter names as well, if set.

The specific API param list object now sets up a number of spin params and min params.

The spin 'select' and 'fixed' parameters are set up in the __init__() method, whereas the
add_min_data() method will be used to add minimisation parameters.

Added the 'scope' arg to the specific API param list add() method.

This will be used to merge the GLOBAL_PARAMS and SPIN_PARAMS lists into one.

Created the specific API param list loop() method for looping over parameter names.

All the get_*() methods of the specific API parameter list objects now call self.check_param().

This new check_param() method raises a RelaxError if the parameter is unknown.