Quasar lens images from a cooperation of ARI and some others with Maidanak
Obs in Ukraine.

This data set has a rather funky history -- it came to us in the
form of a box of CDs.  These contained unreduced images, flats, and junk.  A
first cleanup (bin/fixRaw.py) led to a rough service that contained lots of
dupes and messy stuff.  This is what's in raw.

Then, based on this, Johannes Herzog performed a reduction using Midas
in 2010 (details requested; I doubt we'll still get them).  This
reduction split up the original data (that came in an endless variety of
subdirectories in the first place) into further subdirectories according
to the filter things were observed in, and also generally resulted in FITS
files having 32 bit float pixels rather than the original 16 bit unsigned
ints.  This "reduced" directory hierarchy will be deleted, since all data
from it went into the new data hierarchy.

The data hierarchy was created by a python script reducedToData.py that
traversed this directory trying to collect the data into a sensible file system
structure, removing dupes, etc.

In 2021, Markus added a datalink interface to the reduced data, giving
links to superflats (which were used by Johannes, probably produced
by the Usbek partner, and given to me by Robert).  I've renamed
flats/2003/f[345]/nov08sf.fits.gz to flats/2003/nov08sf[vri].fits.gz,
because that seems to be what Johannes has done, and analogously for
./raw/flats/2004/f?/sep01sf.fits.gz, except there I've make a copy
of sep01sfr.fits.gz as sep01sf.fits.gz, too, again following presumed
procedures of Johannes.

Test set:
  data/Q2237p0305/Johnson_R/red_kk05*
  raw/cd037/jun_2003/jun2903/b1422/
  raw/flats/2003/f3/sfjun3v.fits.gz
  raw/cd010/superfla/sfr.fit.gz