axes limit calculations

[John W. Eaton]

On 26-Aug-2008, Michael Goffioul wrote:

| There's a patch pending in the graphics mq that triggers listeners
| only when a property is actually changed (the same for the built-in
| updaters). This should avoid the problem you mention. The patches
| are base_properties_autogen and property_change_check.

Are these ready to be applied now?  What about

  backend_switch
  generic_octave_to_backend_nofitication
  octave_to_backend_notification

?

Thanks,

jwe