Pydl

This is a bug fix release, see PR 78 for details.

**This release supports Python 3 only.**

This release is the first *production* release with substantial changes to the package infrastructure to reflect modern, mid-2020s Python packaging trends. This is intended to support more rapid releases in the future, and retain consistency with Astropy affiliated package standards.

However the functionality and API are not substantially changed from previous releases.

**This release supports Python 3 only.**

This is a small change from 1.0.0rc1, mostly involving internal package infrastructure.

**This release supports Python 3 only.**

This release candidate is in preparation for a future 1.0 release. This release candidate includes these changes:

* Dropped support for Python 2.
* Astropy 2, 3 & 4 are supported, but tests with astropy 2 fail in a tox environment. This is still being investigated.
* astropy-helpers has been dropped.

Further work needs to be done on documentation and test coverage, among other things.

This will be the last release that supports Python 2. In addition this release mostly contains improvements to documentation, updates to maintain consistency with the Astropy infrastructure, and a few minor bug fixes.

This release is compatible with Astropy 2.0. It may not be compatible with older versions.