DC-FLAG is deprecated (use LOGLAM) but still support it
Document pixellated PSF format
Added sky extinction and emissions data files
docs; cleanup
Added simple row-by-row extraction
Merge branch 'extract' into dev with row-by-row extractions.
added resample function to resample a spectrum on a different binning
Merge branch 'add_trapz' into dev with new function "resample"
(changed name from trapz)
Refactored and added access for wavelength dispersion resolution
Added some tests of util functions
refactor Legendre usage
Removed util.LegendreFit().  Yet another case of something obviously
useful already being in numpy.
Merge branch 'add_wdisp' into dev
make util.resample faster
Faster sinc shifting
Faster sinc shifting
Merge branch 'zfit' into dev to get faster sinc shifting;
no zfit code yet.
First commit zfit code; untested
Checkpoint of partial edits before another round of refactoring
Add check that resample input must be sorted