Work on automatic calculation of inter-PSF variance (from PSF mismatch). First pass, which calculates the variance map from the supplied PSFs, and adds it to the individual PSF variance maps before FFT and fitting.
Fixed error models that caused psf names to be overwritten with their arrays.
Proper handling of posterior-weighted composite IVM
Added citation note to readme. Comments.
Handle unknown posterior image output modes.
Added check for unknown output image types.
Sampler arguments (iter, burn, etc) now encoded in posterior model FITS headers
Attempted fix for section header cards not properly displaying
Comment fixes
Merge pull request #3 from mmechtley/feat/psf-mismatch

Feat/psf mismatch