relax SVN archive

Fix for the tm5 relaxation data grid - some of the relaxation data was negative.

The s2 values are now all smaller than s2f to prevent s2s from being > 1.

Fix for the comments, s2 and s2f were being mixed up.

The initial model-free parameters are no longer perturbed at all - that costs too much time.

Loosened the ts check even further to only 4 significant figs.

The S2s parameter is being calculated from S2 and S2f.

Loosened the S2f, S2s, ts, and tf checks.

Added a system test script for the model-free model tm5 relaxation data grid.

Fix for the tm5 relaxation data grid - the parameter is ts, not tf.

The perturbation to the initial parameter values is an order of magnitude less in opt_and_check() now.

The te, tf, and ts parameters are being scaled to ps in opt_and_check() now.