relax SVN archive

Removed some useless code in the partition_params() function.

Because of the main if-else loop, this code will never be executed!

Updated the generic_fns.value module functions set() and partition_params() to be more general.

The updating is not complete, but works for most of the current codebase. The assumption of a data
analysis type having a diffusion or other tensor has been removed. This has been replaced by the
concept that the params are now partitioned into those that are spin specific and those that are
not. The diffusion tensor stuff will be moved into the model-free code.

Removed the grid search from the 5-state xz model system test.

This has been replaced by a call to value.set() as the grid search is too expensive.

Bug fix for the N-state model disassemble_param_vector() method.

The last probability for state N was being incorrectly calculated!

Created a unit test for the N-state model disassemble_param_vector() method.

Bug fix for the n_state_model user functions.

The class instance now ends in '_obj'.

Bug fix for the unit test of the N-state model assemble_param_vector() method.

The numpy array could not be directly compared so each element is checked individually.

Bug fix for the N-state model assemble_param_vector() method.

The second last probability was missing from the parameter vector.

Created a unit test for the N-state model assemble_param_vector() method.

Bug fix for the N-state model assemble_param_vector() method.

The sim_index arg is now a keyword arg which defaults to None. This arg is not required.