Fixes a regression introduced by 70891e45c0a8b53400b3d9399af8249cc37fb466 which was only tending to show up on Windows (though could in rare cases occur on OSX as well).  Basically if 'arr' is a recarray or FITS_rec, slicing it doesn't work as this code expects.
Cleaning up 0.4.2 changelog in preparation for release
Marking 0.4.2 as released
Added template for v0.4.3 changelog
Tell zest.releaser the template we want to use when adding new version sections to the changelog.  This includes all subsections like API Changes and New Features although those will generally be deleted for bugfix release (but can't hurt to have them either just in case).  I tested this by doing a test release.
Ensure that quantity operations with incompatible types give a useful TypeError