relax SVN archive

This time really turn off the optimisation constraints!

The tm2 model parameters are now properly initialised in the tm2 grid system test script.

Turned constraints off in the tm2 grid system tests to speed up the tests.

Constrained optimisation is not required in these simple models to find the exact solution.

The test_m2_grid_vs_m3() system test should really have been against model m4!

Model m3 has no te parameter, so the model does not fit perfectly.

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.