relax SVN archive

Added the next navigation icons to the paths module.

Added 22x22 Oxygen icons for the back and next wizard buttons.

The buttons are now added to the wizards.

The add_button() method has been converted to build_buttons() and is executed at the start of the
run() wizard method.

changing the description in the user functions load_spins() and read_xyz().

An example for loading the spins for xyz file format was added in the description of the user function load_spins() and the description of the user function read_xyz() was changed. Both user functions are located in 'prompt/structure.py'.

Debugging the user functions load_xyz() and test_read_xyz_internal2().

The user functions load_xyz() in 'generic_fns/structure/internal.py' and test_read_xyz_internal2() in 'test_suite/system_tests/structure.py' have been changed so that the molecule name can be read properly.

Modified the function for checking the inversion-recovery curve fitting results.

The function was still looking for 'exp_2param_neg' fitting...

Renamed the function for checking the curve fitting results.

Renamed the function for checking the curve fitting results.

The system test script for the inversion-recovery function now uses the good function.

Created a system test script for the inversion-recovery function.

This is based on a copy of the script 'relax_fit_exp_2param_neg.py'.