relax SVN archive

The GUI interpreter object has been converted into a singleton.

Fix for the Rx peak height wizard, the user function flush flag was incorrectly named.

Fix for the wizard page _ok() method for the uf_flush flag.

The flush flag is set for the first page of the Rx peak height loading wizard.

Added the ability to flush the GUI interpreter thread in the wizard prior to changing to the next page.

This will help in solving races when a series of user functions are strung one after the other.

The relax controller is no longer shown every time a print out occurs.

This window was appearing far too often causing too much window clutter.

The notification of observers in status.observers.gui_uf has been modified.

The GUI user function pages no longer perform this as the calls to the interpreter are via the
interpreter thread, hence the completion of the page does not signal the completion of the user
function. Instead the interpreter thread (and the synchronous apply() call as well) perform the
notification once complete.

The GUI auto-analyses now initialise with a synchronous call to pipe.create().

This uses the GUI interpreter object apply() method to prevent race conditions. This is important
as the pipe creation needs to be completed prior to the setting up of the GUI elements.

Created the GUI interpreter object apply() for synchronous calls to the user functions.

Redesigned the GUI interpreter object so that the thread is a separate object.

This is to allow both synchronous and asynchronous calls to the interpreter in the future.