[ptx] center" & "fit" according to images selected

[Rich]

that's exactly what i thought about yesterday ;)
i tried to stich photos of clouds - even at almost no wind they still 
had moved slightly, so i wanted to disable all but 3 images and see how 
they fit together (sort of a workaround for lack of zoom in preview) - 
nope, there was a lot of wasted space in preview window

Philippe Gac wrote:
> hi,
> 
> a quasi-bug:
> 
> "center" & "fit" should work according to images selected for display/optim/stitch
> 
> so that you can produce partial panos
> 
> regards
> philippe
-- 
  Rich