relax SVN archive

Lots of improvements for the specification of the model-free global and spin parameters.

The specific API param list base_loop() and loop() methods now match against the parameter scope.

This allows for the differentiation of global from spin parameters.

Improvements and fixes for the minimisation parameters in the specific API param list object.

The specific API param list get_desc() method now skips the error and sim structures.

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.