relax SVN archive

The default list element now defaults to read only, whereas the Combo_list object defaults to not read only.

The List objects can now handle bad user input.

The wiz_read_only flag now defaults to None, to allow the GUI elements to decide the best option.

The read_only flag now is fully functional in the String_list wizard page element.

The wiz_read_only user function flag is now propagated into the String_list GUI elements.

The Combo_list GUI element can now handle an initial size of None, converting this to 1.

The list wizard GUI elements no longer show empty lists.

The Base_value class can now accept the element_type arg value of 'default'.

This will then use the TextCtrl.

The add_keyarg() wiz_element_type arg default is now 'default' to be able to handle all element types.

The previous default of 'text' for a TextCtrl was causing failures with certain wizard GUI elements.

The relax controller is now shown for the auto-generated GUI user functions if 'display' is set.

This is the 'display' variable in the user function data store. This allows all the user functions
which print to STDOUT to pop up the controller in front of the user, so they see the result.