Stack images with alignment (prototype)

[capetillo]

As a user, I would like to be able to stack 2 or more source images with alignment to get parallax so that I can calculate the parallax of an asteroid by taking at least 2 images of the same moving target at the same time but at 2 different locations.

• Align images by source (not by target) with existing code
• Use image reprojection from astropy and feed it inputs, get 1 output with fits headers
• In frontend: add dropdown for options of simple and smart

The reproject_interp function returns the reprojected array as well as an array that provides information on the footprint of the first image in the new reprojected image plane (essentially which pixels in the new image had a corresponding pixel in the old image)...We can then write out the image to a new FITS file.