relax SVN archive

The GUI tests base execute_uf() method now runs all user functions in synchronous mode.

In combination with the previous gui_raise() change, this allows the GUI tests to actually fail when
a RelaxError occurs.

The gui_raise() function now simply re-raises the RelaxError when in test mode.

This allows the GUI test to properly fail.

Missing import required for temporary file deletion.

Removed all of the dir user function args in the BMRB GUI test.

These need to be part of the file argument, as the file and dir args are merged into one GUI
file selection element.

The Combo_list GUI input element SetValue() method now handles single values and lists.

This is required for the GUI tests.

The ComboBox data values are now set to the choices in the __init__() method if not given.

This is required by the GUI tests, as the ResetChoices() method which does the same thing has not
been called.

Shifted the combo_list GUI element into the gui.input_elements package.

Fix for the Sequence_2D GUI element for when the first dimension is variable but the second is fixed.

This allows the bmrb.citation GUI user function 'authors' argument element to be functional.

Another missing import, accidentally deleted.

Reintroduced some accidentally deleted imports.