Fix ReferenceFrame fallback when path != frame path.
Parse frames saved by SBIG CCD-OPS software.
Support different fits filename extensions.
Fix an array bounds error in frame correlation.
Fix a bogus free() when previewing CCD-OPS frames.
Fix incorrectly short buffer size for creating flat pattern.
Subtract dark frames scaled to match the frame exposure.
Set default file prefix from .dat filename.
Trim prompted input to ensure filename matches.
Extract mma_filter_sigma as a parameter and default to 5.
Fix FWHM calculation.