Many dynamically created error messages would create windows that
might even be higher than the user's screen. Instead of boundless
growing this patch creates scrollable panes for the dialog's text on default,
which can be disabled via the new '-scrollable' option.
Scrollable dialogs will also be made vertically resizeable while others
remain fixed-sized.

The about dialog of FIJI Setup is  made unscrollable to attain a suitably sized window.