relax SVN archive

Created a few additional specific API common methods.

These include:
_return_data_name()
_return_data_name_global()
_return_units_global()

Created the structural API GLOBAL_PARAMS structure.

This is also based on the Param_list object and is initialised in the base class for all analyses.

The internal objects of the Param_list object are now private.

Created the Param_list.get_units() method for returning the units corresponding to the parameter.

Updated the consistency testing code to use the new SPIN_PARAMS specific API structure.

The reduced spectral density analysis code now uses the SPIN_PARAMS API object.

Fix for the frame order analysis as one of the common API methods has been renamed.

_return_data_name() is now _return_data_name_spin().

Some of the specific API common methods now use the new SPIN_PARAM structure.

Some are now spin specific, and a few new spin specific methods have been added for the specific
code to alias.

Created the Param_list.get_grace_string() method for returning the Grace string.

Created a special specific API object called SPIN_PARAMS.

This will be used to handle all operations to do with model parameters. This is initialised in the
base class, and can be set up in the specific __init__() methods. The object Param_list has methods
for parameter initialisation (where all info is specified such as Grace string, units, default
value, etc) and for determining if a parameter exists. More methods will be added in the future to
expand the usability of this object and to simplify the specific API methods.