relax SVN archive

Yet another fix for the N-state model target functions.

The Ln3+ optimisation with the tensors fixed was resulting in a chi2 value of 0 at all times!

Added another check to the metal optimisation N-state model system test script.

This now catches if the metal has been optimised when the tensors are fixed.

One last fix for the setup of the N-state model target functions.

Fixes for all of the N-state models - the indices were not being incremented!

Fix for the setup of the 2-domain N-state model.

Fixes for the population N-state model target function.

Fixes for the population N-state model for when subsets of alignment tensors are fixed.

This is in the function, gradient, and Hessian code.

Updated the metal_pos_opt.py N-state model system test script to catch another code design problem.

Removed an empty line.

The N-state model can now be optimised with a subset of the alignment tensors fixed.

This required a reworking of the data assembly and target function code.