relax SVN archive

The GUI show_pipe_editor() method is now the place where the methods are registered with the observers.

This is a partial bug fix for the GUI tests. The hiding mechanism of the window with unregistration
requires this.

Shifted all of the observer registration and unregistration to observer_setup() in the pipe editor.

Bug fix for the GUI tests setUp() method - the observer objects must no be reset!

Improved debugging print outs for the observer objects.

The method name is now stored and included in all the observer 'debug>' printouts.

Removed the notebook tab deletion from the GUI tests tearDown() method.

This should be performed when a relax reset happens, so it is not needed in the tearDown() method
just before the reset() call. This change reveals another set of GUI bugs!

Redesign of the setUp() and tearDown() methods of the GUI tests.

This is needed as the current design does not work under MS Windows! Instead of created a new wx
app for each test (this dies in Windows as it looks like only a limited number of toolbars can be
created), only one app is created and is recycled. This design better mimics GUI usage anyway.

This change uncovers a few GUI bugs not caught by the previous design.

Bug fix for the GUI test suite setUp() method.

The observer objects are reset at the start to get around a bug when the setUp() method fails for a
previous test.

Bug fix for the running of the GUI tests on Mac OS X - the relax GUI 'app' needs to be deleted after each test.

Bug fix for the Dead_uf_pages.test_mol_create() GUI test for MS Windows.

The _execute_uf() method is now used instead of simulating _ok() calls.

Bug fix for the GUI tests on MS Windows.

The GuiTestCase._execute_uf() method now prevents the wizard from running when calling the GUI
user function by setting the wx_wizard_run argument to False. This allows the wizard _ok() call to
function on Windows.