Cancel exposure if autoguiding parameters exceeded

[Aaron Dalton]

This is a handy feature present in AstroPhotography Tool. Basically if an autoguiding parameter is exceeded (in APT defined by a pixel value distance to the guide star, say 2 pixels off center) the exposure cancels. This can then result in starting a new exposure, or possibly waiting a preset amount of time before trying to resume.

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It can help save time and wasted images if a gust of wind or passerby nudges the scope, 1 minute into a 5+ minute exposure without interfering with the whole imaging sequence.

[Stefan B]

Duplicate of #582.