relax SVN archive

The Value.SetValue() method can handle default values when the list is empty.

For the Value wizard page element, the default can be the string or data for a ComboBox now.

If the default is a data value, then this is translated to the string. This allows the default in
the user function data objects to be either the string or data value, removing a source of coding
errors.

Fix for the Selector_file GUI wizard page element - the default value cannot be None.

The value of None was translated to wx.EmptyString too far down in the initialisation, after it was
being used. This caused most file selection GUI elements to fail.

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

Created icons and wizard graphics for the frame_order user functions.

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

Fix for the typo error checking in the __setattr__() method.

The additional variable can be set multiple times by appending to the list!

Fix for the short title of the align_tensor.reduction user function.

Added error checking to the Uf_container to eliminate typo coding mistakes.

This checks that a variable is not set twice (copy and paste error).

Fixes for some more short titles in the user functions.