relax SVN archive

Fix for the test_tm2_grid system test, the diffusion tensor should not be initialised.

Simplified the 3 system tests based on the model-free tm2 grid by shifting all the code to the script.

Created a system test for checking model-free model m3 against the tm2 grid data.

The same setup script is now used for all of the system tests using the tm2 grid data.

Created a system test for checking model-free model m2 against the tm2 grid.

Newline fix.

Fix for the test_tm2_grid() system test - the correct values of the correlations times are being checked.

Bug fix for the module for back-calculating relaxation data from model-free parameters.

The heteronucleus was being ignored when calculating the 5 frequencies of the spectral density
function.

Set the initial param values of the test_tm2_grid() system test to the real ones.

The model-free system test value_test() method is now checking the local tm value from a number of tests.