relax SVN archive

Multiple unregistrations of observer methods are now possible without a RelaxError.

This allows multiple code paths to unregister methods to allow for pre-removal of methods to avoid
queued wx events in wxGTK from occurring on dead or missing objects.

Created observer_register() for all GUI analyses for method registration and unregistration.

This method allows for external calls to observer_register() to pre-remove the methods from the
observer objects.

Added debugging print outs to the delete_all() analysis method.

More advanced debugging print outs for the delete_analysis() method.

Added some heavy debugging code to the GUI analysis delete_analysis() method.

This will hopefully allow the analysis deletion problems to be finally solved.

Bug fix for the GUI when deleting analysis tabs.

The deletion of analysis tabs was previously failing in certain cases. The problem was the
generic_fns.pipes.delete() call in the middle of the delete_analysis() method causing a notification
to be sent to the pipe_deletion GUI observer object, which would then handle the pipe deletion prior
to the completion of the delete_analysis() call causing things to get out of sync.

Fix for a bug triggered by wxPython 2.9 when deleting the last analysis tab.

The self.notebook object is now deleted when the set_init_state() method is called, allowing it to
be properly accessed and recreated.

Converted the pipe switching with GUI tab switching to synchronous to avoid rare races.

This racing is triggered by wxPython 2.9. This change should not affect wxPython 2.8 installs.

The analysis deletion buttons now do nothing if the notebook is not created yet.

This avoids problems on the new wxPython 2.9 versions.

Missing import.