Makes a copy of the masterdark and index file in the calibration library _FILE_LIBRARY_DARK_
This primitive is suitable for optical imaging instruments.
Processing only occurs for dark frames, and when the steering header MAKE_DARK is true.
"
dark_instrument_UT
night_binXbinxYbin"
where instrument
is the LCOGT instrument identifier and
Xbin,
Ybin
are the binning factors in X and Y.