Optimised PreviewDialog updating.
Now asynchronously redraws while capturing next frame.
Also changed to use faster scaling algorithm.
Optimised PreviewDialog to avoid scaling where possible.
Fixed FrameGrabberDialog to start frame grabber when sampling.
Fixed AstroStackFrame to exit when quit menu item selected.
Not just dispose().
Minor bug fix in FrameGrabberDialog.
Added initial image stabilisation support.
Added initial StabilisationDialog to change image stabilisation settings.
Removed debugging statements from ImageStabiliser.
Unified ImageStabiliser.firstBlob() for both directions (XY).
Fixed AstroStackFrame layout.