relax SVN archive

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.