Add rotator positing/angle in image file pattern

[Former user]

I was hoping to add rotator position/degrees to image file pattern path. It would help reset the imaging train after changing back focus behind the rotator. Inevitably when you rethread everything back together the camera threads into a different orientation and I have to reset the rotator at a zero position then get back to the desired rotation of the image file that I am framing from.

[Dale Ghent]

The rotator angle is recorded in both the FITS and XISF file headers under the ROTATE and ROTATANG keywords.

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