relax SVN archive

The dialog ShowModal() and Destroy() methods are now executed by the wizard run() method.

Modifying the user function 'read_xyz()'.

This is Han's patch https://gna.org/task/download.php?file_id=13243 attached to the task
http://gna.org/task/?7404.

In the user function generic_fns/structure/main.py a single blank line was removed.

The wizard size and title are now class arguments rather than hardcoded variables.

Created the UF_panel class derived from Wiz_panel for the user function specific wizard panels.

Created the Wiz_window.display_page() method for displaying the given page.

Created the add_page() and run() methods for the Wiz_window class.

These are currently non-functional.

Temporarily turned off all user functions, save value.set().

This will be used to redesign all of the wizard and user function dialogs and panels.

Some playing around with the analysis wizard.

This is going to take some work!

Split Wiz_window into two classes, Wiz_window (dialog) and Wiz_panel (panel).

This will allow a series of panels to be created and strung together in one dialog, i.e. a wizard.

Added the infrastructure for the operation of the 'File->New analysis' menu entry.

The skeleton gui.analyses.wizard.Analysis_wizard class has been created to have the run() method
which returns the analysis type and the data pipe name to the relax_gui new() method.