relax SVN archive

Added the reset_min_stats() method to reset all minimisation stats prior to optimisation.

Fixes for the model_selection() method of the full_analysis.py script.

The model selection pipe must be deleted each time for the automatic CONV_LOOP looping to be
possible.

Fix for the full_analysis.py script. The references to the diffusion tensor object were incorrect.

Another fix for the duplicate_data() method.

The diffusion tensor object was being copied from the source pipe back to the source pipe!

Fixes for the duplicate_data() method.

The diffusion tensor object now has its sub-objects compared.

Fix for the OMP model-free optimisation system test.

The 'aic' data pipe already exists, so now it is deleted prior to model selection.

Fix for the final data pipe.

This is created by model selection, so pipe.create() doesn't need to be called.

Added a few additional comments.

Removed a useless check for models of zero length.

Fix for the model_setup() method.

The diffusion tensor was incorrectly referenced and the model, parameters, and equation were not
always being set.