relax SVN archive

Shifted the core of the data_names() specific analysis API method into the parameter list object.

Fix for one of the value.set user function unit tests.

The 'alpha2' N-state model parameter no longer exists, and the '2' is now supplied as index=2.

The new index argument for the value.set user function now defaults to zero.

This is for backwards compatibility as the default value of None was not handled by the user
function backend.

Clean up of the N-state model user function docstrings.

The pseudo-parameter names such as 'p0', 'p1', etc. no longer exist.

Converted all of the N-state model parameters to use the parameter list object.

The default_value(), return_data_name() and return_grace_string() API methods have also been deleted
as these have been superseded by the parameter list object.

Converted the remaining N-state model system tests to use the new value.set index argument.

Expansion of the value.set user function to handle list-type data.

The value.set user function can now handle parameters which consist of lists of values. The index
argument has been added to allow the index of the list to be specified, and this is then propagated
into the specific analysis API.

Converted the N_state_model.test_5_state_xz system test to use a new way to set parameters.

Instead of using pseudo-parameters for the value.set user function such as 'p0', 'p1', etc. for the
probabilities, which are then converted into the 'probs' parameter with the index taken from the
name, instead the index is now directly given. The value.set user function will need to be modified
to handle this. The aim is to standardise the parameter list object for the N-state model analysis.

Eliminated the model-free specific analysis API data_type() method.

This functionality is now provided by the parameter list object.

Eliminated the last of the specific analysis API return_units() methods.

This functionality is now provided by the parameter list object.