Commits on Dec 20, 2018

1. Reduce ISR code duplication. …

   The ISR code was split between ip_isr and the obs_ packages, with the
   ip_isr and obs_subaru containing parallel ISR reduction pathways.
   This ticket merges those pathways into a single set of ISR functions
   in the ip_isr package, removing the duplication of code.  The merged
   codebase also makes additional useful functions from the obs_subaru
   ISR available to other cameras, and the new ISR code now profiles
   debug points, thumbnail images, and post-correction statistics to
   check processing quality.
   
   The DECam specific ISR task class, as well as the CP ISR class, have
   been removed in favor of the one in ip_isr.  There are some changes in
   the ISR ordering: the variance is now constructed before the
   linearization instead of before.  The crosstalk is performed before
   assembly, bias subtraction, variance construction, and linearization
   to better match previous processing results.  To support this change,
   the DECam crosstalk code has been updated to ensure the corrections
   are aligned with the crosstalk ghosts.
   
   The isr.py configuration has been updated to explicitly list all
   options used for DECam.  The DecamMapper has had entries for ISR
   thumbnails and the ISR metadata added to allow these products to be
   persisted.

   

   czwa committed Dec 20, 2018
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