relax SVN archive

Improved print out from mesg_opt_debug().

Added the local_tm parameter to the model-free mesg_opt_debug() system test method.

Modified the model-free system test method mesg_opt_debug() to handle all model-free models.

Removed a duplicated chi2 test from value_test().

The test_local_tm_10_S2_0_8_te_40 model-free system test is now checking the parameter values.

Improved the model-free system test value_test() method to handle all types of model-free data.

This includes not checking certain values or statistic unless specifically asked for.

Created the test_local_tm_10_S2_0_8_te_40 system test for testing model-free optimisation.

Added a new model-free test set, calculated using the new back_calc.py module.

Created a module to aid in the back-calculation of relaxation data from model-free parameters.

Fix for the removal of all data pipes prior to initial optimisation.

The generic_fns.pipes.get_pipe() function was being used to test if a pipe exists rather than
has_pipe(), causing a RelaxError if the pipe does not already exist.