- Update to 5.1.1
  # API Changes
  ## astropy.wcs
  * The pixel argument to
    astropy.visualization.wcsaxes.ticklabels.TickLabels.add no
    longer does anything, is deprecated, and will be removed in a
    future astropy version. It has been replaced by a new required
    data argument, which should be used to specify the data
    coordinates of the tick label being added.
  * This changes has been made because it is (in general) not
    possible to correctly calculate pixel coordinates before
    Matplotlib is drawing a figure. [#12630]
  # Bug Fixes
  ## astropy.coordinates
  * Fixed a bug that prevented SkyOffsetFrame instances to be
    pickled by adding a custom __reduce__ method to the class (see
    issue #9249). [#13305]
  * Fixed the check for invalid Latitude values for float32 values.
    Latitude now accepts the float32 value of pi/2, which was
    rejected before because a comparison was made using the
    slightly smaller float64 representation. See issue #13708.
    [#13745]
  ## astropy.io.ascii
  * Fixed confusing chained exception messages of read() function
    when it fails. [#13170]
  * When writing out a :class:`~astropy.table.Table` to HTML
    format, the formats keyword argument to the
    :meth:`~astropy.table.Table.write` method will now be applied.
    [#13453]
  ## astropy.io.fits
  * heapsize is now checked for VLA tables. An error is thrown
    whether P format is used but the heap size is bigger than what
    can be indexed with a 32 bit signed int. [#13429]
  * Fix parsing of ascii TFORM when precision is missing. [#13520]
  * A compressed image HDU created from the header of a PRIMARY
    HDU, now correctly updates 'XTENSION' and 'SIMPLE' keywords.
    [#13557]
  * Empty variable-length arrays are now properly handled when
    pathological combinations of heapoffset and heapsize are
    encountered. [#13621]
  * PCOUNT and GCOUNT keywords are now removed from an uncompressed
    Primary header, for compliancy with fitsverify behavior.
    [#13753]
  ## astropy.modeling
  * Bugfix for using MagUnit units on model parameters. [#13158]
  * Fix bug in using non-linear fitters to fit 0-degree polynomials
    using weights. [#13628]
  ## astropy.table
  * Fix a problem where accessing one field of a structured column
    returned a Column with the same info as the original column.
    This resulted in unintuitive behavior in general and an
    exception if the format for the column was set. [#13269]
  * Tables with columns with structured data can now be properly
    stacked and joined. [#13306]
  * Update jQuery to 3.6.0, to pick up security fixes. [#13438]
  * Fix a Python 3.11 compatibility issue. Ensure that when
    removing a table column that the pprint_include_names or
    pprint_exclude_names attributes get updated correctly. [#13639]
  * When using add_columns with same indexes in indexes option or
    without specifying the option, the order of the new columns
    will now be kept. [#13783]
  * Fix a bug when printing or getting the representation of a
    multidimensional table column that has a zero dimension.
    [#13838]
  * Ensure that mixin columns and their info are not shared between
    tables even when their underlying data is shared with
    copy=False. [#13842]
  ## astropy.time
  * Fix Time.insert() on times which have their out_subfmt set.
    [#12732]
  * Prevent Time() from being initialized with an invalid precision
    leading to incorrect results when representing the time as a
    string. [#13068]
  * Fix a bug in Time where a date string like "2022-08-01.123" was
    being parsed as an ISO-format time "2022-08-01 00:00:00.123".
    The fractional part at the end of the string was being taken as
    seconds. Now this raises an exception because the string is not
    in ISO format. [#13731]
  ## astropy.units
  * Significantly improved the performance of parsing composite
    units with the FITS format, by ensuring the detailed_exception
    argument is properly passed on and thus used. [#12699]
  * Ensure that np.concatenate on quantities can take a dtype
    argument (added in numpy 1.20). [#13323]
  * Ensure that the units of any initial argument to reductions
    such as np.add.reduce (which underlies np.sum) are properly
    taken into account. [#13340]
  ## astropy.utils
  * Ensure that np.concatenate on masked data can take a dtype
    argument (added in numpy 1.20). [#13323]
  * Fix error when suppressing download progress bar while using
    non-default sys.stdout stream. [#13352]
  * Ensure str and repr work properly for Masked versions of
    structured subarrays. [#13404]
  * If an attribute is created using deprecated_attribute() with
    the alternative argument then getting or setting the value of
    the deprecated attribute now accesses its replacement. [#13824]
  ## astropy.visualization
  * Fixed calling .tight_layout() on a WCSAxes. [#12418]
  ## astropy.wcs
  * WCS.pixel_to_world now creates an EarthLocation object using
    MJD-AVG if present before falling back to the old behaviour of
    using MJD-OBS. [#12598]
  * The locations of WCSAxes ticks and tick-labels are now
    correctly calculated when the DPI of a figure changes between a
    WCSAxes being created and the figure being drawn, or when a
    rasterized artist is added to the WCSAxes. [#12630]
  * Fix a bug where SlicedLowLevelWCS.world_to_pixel_values would
    break when the result of the transform is dependent on the
    coordinate of a sliced out pixel. [#13579]
  * Updated bundled WCSLIB version to 7.12. This update includes
    bug fixes to wcssub() in how it handles temporal axes with -TAB
    and fixes handling of status returns from linp2x() and linx2p()
    relating to distortion functions, in particular affecting TPV
    distortions - see #13509. For a full list of changes - see
    http://www.atnf.csiro.au/people/mcalabre/WCS/CHANGES or
    astropy/cextern/wcslib/CHANGES. [#13635]
  * Fixed WCS validation not working properly if HDUList is needed
    for multi-extension FITS file. [#13668]

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