relax SVN archive

The Uf_page.create_page() method now accepts the 'sync' arg for deciding user function operation.

Fix for the Uf_page.create_page() method - the wizard instance is now passed into the method.

Shifted the user function page creation into the Uf_object.create_page() method.

This will be useful for the creation of the special wizards which are composed of many user function
pages strung together. In this case, the __call__() method which creates and packs the page into a
Wiz_window instance can be bypassed.

The Spectral_error_type_page class now inherits from Wiz_page as UF_page has been eliminated.

Import clean up, including the now eliminated uf_pages package.

Eliminated the gui.uf_pages package.

This removes a lot of code and many modules! This has all been rendered useless by the
auto-generated user functions.

Eliminated the old user function menu system.

The auto-generated menu system is now complete, so the old system is now of no use.

Changed the arg description of the align_tensor.copy and diffusion_tensor.copy user functions.

This improves the argument description by making it more readable.

Renamed the 'user_functions' module to 'uf_objects'.

This is due to a name clash with the 'user_functions' package.

Renamed the auto-generation user function module from 'objects' to 'user_functions'.