relax SVN archive

Converted the dasha user functions to the auto-generation design.

Added support for the directory selection wizard page element for the auto-generated user functions.

This uses the new Selector_dir GUI element.

Converted the consistency_tests user functions to the auto-generation design.

Converted the angles user functions to the auto-generation design.

Converted the bruker user functions to the auto-generation design.

Converted all of the state user functions to the auto-generation design.

Fix for the bmrb.read and bmrb.write user function backends.

The directory argument name change from dir to directory in the prompt interface was not compatible
with the auto-generation system. Therefore the argument has been changed to 'dir' everywhere.

Fix for the auto-generated bmrb.script user function - the model selection arg can be None.

List of lists types are now properly handed by the auto-generated user function in prompt/scripts.

Fix for the relax_data.back_calc user function data.

All arguments can be None!