relax SVN archive

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.

Bug fix for the setup of the N-state model target function.

This is triggered by missing data.

Created the test_metal_pos_opt() N-state model system test.

Specific RDC and PCS data for this test has also been generated.

Created a system test script for checking one type of algorithm for Ln3+ position optimisation.