relax SVN archive

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!

Significantly increased the number of icons used in the auto-generated user function menus.

Added icons and wizard graphics for the align_tensor user functions.

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

The buttons of the Selector_file wizard page element now have better tooltips.

The open button now has a tooltip related to opening. The preview button has the "Preview" tooltip
rather than the element_file_sel tooltip, so that the user knows what the button does.

Missing import.