Allow creation of pngs from 3D and 4D arrays #1513
Merged
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Motivated by bad pixel monitor failures. This PR updates our function that creates a png from a given fits file. Previously the function assumed the fits file contained a 2D array, and failed if the array had some other number of dimentions. This fix allows 3D and 4D arrays to be used. An appropriate 2D array is extracted from the 3D or 4D array.
In the bad pixel monitor, this function had been failing because it was being given rateints files, which have 3 dimensions.