UIST

There is no ARRAY_TESTS recipe. Instead there are DARK_AND_BPM and
MEASURE_READNOISE.

There are JITTER_SELF_FLAT variants with a higher registration completeness (0.5 from 0.4) giving purer registration but may rely on the telescope offsets more often.

Measurement of the full-array statistics avoids the outer 5% border, in order to avoid aberrant pixels which can still bias the clipped mean.

Raw polarimetric data are flipped along the second axis to counter a bug in POLPACK computing vector orientations for left-handed co-ordinates.