#280 Scanning minimized

[Riksoft]

It would be nice having only a progress indicator when
a manual scanning is in progress.
(Using the caption of the window, automatically we also
gain the possibility to move the mouse on that
minimized icon seing the percentage).

BUT,

simplifing the development, at the moment it whould
also nice having the possibility to minimize the
scanning window, so one can work while scanning.