relax SVN archive

Converted the copySign() docstring to epydoc format.

Bug fix for the model-free overfit_deselect() method.

The spin.xh_vect structure should only be checked for if structural info is required.

Modified all the model-free optimisation system tests to compare 'select' to bools.

Converted the model-free overfit_deselect() method to use booleans.

Modified all the model-free optimisation system tests to check if the spins are properly selected.

Changed 'unselected' to 'deselected'.

Bug fix in the test_opt_constr_sd_back_S2_0_970_te_2048_Rex_0_149() system test.

'spin.chi2' was being accessed as 'spin.chi'.

Modified the model-free minimise() method to use the new return_spin_from_index() function.

Created the new function generic_fns.selection.return_spin_from_index().

Missing import of return_spin().