allow nx!=ny in midpoint calculation
improve image shift efficiency
fix two typos nx -> ny
Fix CROTA2 to use WCS default of 0.0 if keyword not present.
same
test set bscale
Multiple changes from Venus transit work and exportdata cleanup. im_patch will soon replace hg_patch, which is now deprecated. im_patch can now properly do image sub-pixel registration when asked.
misc
Add RequestID and option to write full headers.
Fixed comments and doc. Force -h if requestid is specified.
Added Gaussian smoothing option. Fixed some scaling and centering errors. Added write headers flag.
Add program
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