[AstroPy] [ANN] SEP v0.2.0

[Kyle Barbary]

I'm happy to announce the release of SEP v0.2.0.

SEP makes available some of the algorithms in Source Extractor as
stand-alone functions and classes. These operate directly on in-memory
arrays (no FITS files, configuration files, etc). The code is derived
directly from the Source Extractor code base.

Changes from v0.1.0:

- new aperture photometry functions
- Kron radius function
- variable detection threshold in object detection
- bug fixes
- better documentation: http://sep.readthedocs.org

Source code: https://github.com/kbarbary/sep

The new version is almost entirely backwards-compatible with v0.1.0, but
there are some deprecations. See
https://github.com/kbarbary/sep/blob/master/CHANGES.md.

Finally, note that SEP overlaps with some of the functionality in
photutils, and in fact some code originally written for photutils has been
added to SEP. We've discussed including SEP as a "low-level" dependency in
photutils and this release is a step towards enabling that.

Best,
- Kyle
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