relax SVN archive

Bug fix for the new analysis wizard cancelling on Mac OS X.

A status variable is no longer returned. Instead the EndModal() dialog method is being used to
terminate modal wizards, returning the value of wx.ID_OK. The new analysis wizard is now checking
for this return code.

The main window toolbar icons are now being partly disabled with the execution lock.

Bug fix for the toolbar and status bar - they were both being assigned to self.bar!!

Added a toolbar to the main relax window with some of the most important menu entries as icons.

Changed some of the icons paths for the main menu entries.

Added all the sizes of the preferences-system-performance.png oxygen icon.

Added some more larger sized oxygen icons.

Bug fix for the closure of the new analysis wizard window.

Closure of the wizard window would trigger an error in some of the wizards as the _status flag would
remain as True. Now the close event is handled and the flag is set to False. All other calls to
self.Close() have been replaced by Destroy() to bypass the closure event handler.

Bug fix for MS Windows - the spin viewer window was being hidden by the main window when switching pipes.

The window is now being re-raised to the front.

Bug fix for racing in the spin viewer window when switching pipes.

The pipe.switch user function was queue rather than synchronously executed, so that the execution
lock would block the switching of analysis tabs if too many spins were present.