[AstroPy] ccdproc 2.2.0 releases

[Craig, Matthew W]

Dear colleagues,

I am delighted to announce the release of ccdproc 2.2.

This release contains some modest improvements in image combination performance.  For the best performance, install the [`bottleneck`](https://bottleneck.readthedocs.io/en/latest/) package. With bottleneck installed, `median_combine` is 2x faster.

Changes in this version:

+ Image combination is faster for average and sum combine, and improves for all operations if the bottleneck package is installed.
+ Pixel-wise weighting can be done for sum and average combine.
+ When filtering an ImageFileCollection by keyword value, and not explicitly using a regex search pattern (`regex_match=True`), escape all special characters in the keyword value for a successful search.
+ Return mask and uncertainty from combine even if input images have no mask or uncertainty.

Thanks to all of the people who contributed code, opened issues, and/or provided advice:

+ Timothy P. Ellsworth-Bowers (@tbowers7) and Pey Lian Lim (@pllim) wrote code for this release.
+ Yoonsoo Back (@ysBach) and Simon Conseil (@saimn) provided extensive input on image combination.
+ Issues opened by Yash Gondhalekar (@Yash-10), Michael Kelley (@mkelley), Jane Rigby (@janerigby), and Aayushi Verma
(@awesomecosmos) were closed in this release.
+ Rieke Bohemann and Tim-Oliver Husser  (@thusser) provided extensive details about issues with median combination which have been addressed in this release.

Thanks,
Matt Craig

schedule: http://physics.mnstate.edu/craig
——
Professor
Department of Physics and Astronomy
Minnesota State University Moorhead
1104 7th Ave S, Moorhead, MN 56563

Office: Hagen 307F
Phone: (218) 477-2439
Fax: (218) 477-2290

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