Fitsio

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Changes

- Row subsets of table data are returned in the order sent by the user
rather than sorted and unique. E.g. rows = [2, 2, 1] will return
data corresponding to that order of rows, including duplicates.
- Removed deprecated `pkg_resources` from tests (M. Becker).
- converted tests to use pytest
- Improved doc strings (N. Tessore)

Bug Fixes
- Bug updating header string cards was adding new key rather than updating
- Bug gzip compression when not using quantization

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Bug Fixes
- Bug in repr of FITS where it only worked the first time it was generated

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Bug Fixes

- Bug converting extension names, should just ensure ascii rather than
subset of ascii
- Bugs in the repr of headers where history keywords had extra spaces.
Also a bug with not upper casing things like 1.0E20 which is the
fits standard

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Bug Fixes

- fixed bug where Updating an existing record in an image header raises an
exception (user ussegliog)
- fix bug append not forwarding arguments to write (Nicolas Tessore)

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Bug Fixes

- Deal with case that a header keyword has non-ascii
characters and the value is numerical. In this case
we cannot convert the value because fits_read_key
can segfault in some scenarios. We instead return
a string.
- Fixed residual segfaults for header cards with non-ascii
characters.
- HIERARCH keywords are now properly parsed.
- Header keywords with `*`, `` or `?` in them now properly raise an error
before writing since the generated FITS files cannot be read.

Changes

- Non-allowed characters in header keywords are now converted to `_` instead
of `JUNK___...`.

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New Features

- Moved most testing to GitHub actions (linux, osx).
- Added testing on ppc64le w/ TravisCI (thanks asellappen)

Bug Fixes

- Don't remove BLANK keywords in header clean
- Preserve order of comments in header

Compatibility changes

- moved to sing `bool` rather than `np.bool` to be compatible
with numpy 1.2