FORS 5.3.32 (2018-04-01):
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 - Improvements of the documentation (e.g. cosmic rays correction algorithm is documented)
 - The fors_calib interactive window shows correctly removed lines in the residuals window
 - Fixed issues that would make the recipe abort with error in case of non-illuminated slits
 - Fixed issues with header keywords in fors_pmos_calib
