relax SVN archive

Created a system test Mol_res_spin.test_residue_delete() demonstrating a failure of the user function.

Deleting the first residue removes the entire sequence!

The free file format GUI element is now doing something in the auto-generated user functions.

This was previously not returning any data.

Argument name fix for the dictionary returned by the Free_file_format.GetValue() method.

The error column argument for the user functions is called 'error_col'.

Created the Free_file_format.GetValue() method for returning a dict of args.

This abstracts the GUI element's input fields.

Redesigned the set up of the user function arguments in the GUI pages.

The wizard element_*() methods have been removed as these were pointless wrappers. The Uf_page
add_contents() method now builds the argument GUI elements and stores them in the self.uf_args
dictionary. The wizard methods Clear(), GetValue(), ResetChoices() and SetValue() have been shifted
into the Uf_page class as these are only for the auto-generated user functions.

More independence for the wizard_elements - the height of the element must now be passed in as an arg.

Started to make the wizard_elements module classes independent of the wizard.

The references to parent._div_left have been eliminated, this is now expected to be passed in by the
parent which has that variable as the divider arg.

Removal of an unused class variable.

Added the user_functions.script module which should have been committed in r16303.

Converted the Interpreter.script() method into a proper user function.

This pseudo user function was no longer functional after the auto-generation changes.