Release POPPY 0.6.1

[josePhoenix]

• WavefrontError and subclasses now handle tilts and shifts correctly (Add preserve_egg_dir: True to allow build to succeed #229, @mperrin) Thanks @corcoted for reporting!
• Fix the test_zernikes_rms test case to correctly take the absolute value of the RMS error, support outside= for hexike_basis, enforce which arguments are required for zernike(). (drizzlepac: bump revision #223, @mperrin) Thanks to @kvangorkom for reporting!
• Bug fix for stricter Quantity behavior (UnitTypeError) in Astropy 2.0 (@mperrin)
• Added an optional parameter “mergemode” to CompoundAnalyticOptic which provides two ways to combine AnalyticOptics: mergemode="and" is the previous behavior (and new default), mergemode="or" adds the transmissions of the optics, correcting for any overlap. (Make stsci.tools a depedency of acstools #227, @corcoted)
• Add HexagonFieldStop optic (useful for making hexagon image masks for JWST WFSC, among other misc tasks.) (@mperrin)
• Fix behavior where zernike.arbitrary_basis would sometimes clip apertures (Bumped CRDS version to 7.1.3 #222, @kvangorkom)
• Fix propagate_direct in fresnel wavefront as described in issue Release drizzlepac 2.1.15 #216 (htc_utils: Fix tag and repo url #218, @maciekgroch)
• display_ee() was not passing the ext= argument through to radial_profile(), but now it does. (Update glue-core and glueviz to 0.10.4 #220, @josePhoenix)
• Fix displaying planes where what='amplitude' (Update stsci.tools -> 3.4.10 #217, @maciekgroch)
• Fix handling of FITSOpticalElement big-endian arrays to match recent changes in SciPy (@mperrin) Thanks to @douglase for reporting!
• radial_profile now handles nan values in radial standard deviations (parsley: Fix package naming typo #214, @douglase)
• The FITS header keywords that are meaningful to POPPY are now documented in POPPY FITS Header Keywords Definitions and a new PIXUNIT keyword encodes “units of the pixels in the header, typically either arcsecond or meter” (stwcs 1.2.5 -> 1.3.2.rc1 #205, @douglase)
• A typo in the handling of the markcentroid argument to display_psf is now fixed (so the argument can be set True) (purge_path 1.0.0 -> 1.2.0 #211, @josePhoenix)
• radial_profile now accepts an optional pa_range= argument to specify the [min, max] position angles to be included in the radial profile. (@mperrin)
• Fixes in POPPY to account for the fact that NumPy 1.12+ raises an IndexError when non-integers are used to index an array (hstcal 1.1.1. --> 1.2.0rc1 #203, @kmdouglass)
• POPPY demonstration notebooks have been refreshed by @douglase to match output of the current code

[pllim]

Oh... Zernike. Haven't heard that since HSI. Did someone port that over or is this something else?

[josePhoenix]

POPPY has a library to compute Zernike polynomials (and various derived *-ikes) included to support introducing aberrations in an optical sytem

[josePhoenix]

I believe it's unrelated to the HSI code, though Kyle may have borrowed from POPPY...

[kvangorkom]

I don't believe there's any code overlap between the two libraries! (Most of the Zernike code in the HSI library predates me.)

[pllim]

Yeah, I wrote the HSI one from a Matlab code. XD

Good to know there's a better option now!

[josePhoenix]

We had to immediately follow this with a 0.6.1 release to try and work around an astropy/package-template and astropy/astropy-helpers issue. (See mperrin/poppy#170 (comment) 🙄)