relax SVN archive

Fixes for the tm3 and tm4 relaxation data grids.

Added a system test script for the tm1 grid.

Added system tests for the optimisation of the normal model-free models against the all the tm parameter grids.

Added system tests for the optimisation of all the local tm model-free parameter grids.

Fix for the tm0 and tm9 relaxation data grids.

The data was a mixture of 15N spectral densities and 13C relaxation values!

Modified the opt_tm2_grid.py model-free system test script to use the abstracted opt_tm_fns.py fns.

Modified the module docstring, and passed in the 'tm0_grid' directory to setup_data().

Abstracted the 'tm._grid' directory to a function arg and converted the tests to 13C.

Converted all the local tm model grids to use 13C.

This is to make the testing easier.

Fix for the opt_tm0_grid.py script, the parameter values now should be sent in.