Merge pull request #16 from astromatic/fix/finite

Fix portability issue on MacOS with obsolete finite() function.

Merge pull request #14 from astromatic/icx

Icx

Fixed PSF map RA axis labelling bug (thanks to J.-B. Marquette).

Pushed version number to 3.21.1.

Merge pull request #6 from iru-/patch-1

Doc: fix format typo

Tagged version 3.17.1

Tagged PSFEx release 3.17.0.

Tagged release.

Tagged release.