Pictures shoud be scaled down into wrapped keogram

[jschmied]

If the camera uses a big part of the picture, the keogram is over the picture. A option to scale down the picture would be nice.

[aaronwmorris]

Scaling the picture before wrapping the keogram kind of over-complicates some of the operations involved with adjusting the offset of the image circle, but I will meet you in the middle.

Merged #1655 to scale the final image after the keogram is wrapped around the picture. You still need to adjust your image circle size so that the keogram circle is properly sized for the picture. It is fine if the image circle size is larger than the dimensions of your image, indi-allsky just makes the picture bigger to fit.

Edit: If you tell me your camera model and the lens you are using, I can probably give you the correct image circle size.