Log Message:

1.0.4 (2015-08-11)
------------------

New Features
^^^^^^^^^^^^

- ``astropy.convolution``

  - Modified Cython functions to release the GIL. This enables convolution
    to be parallelized effectively and gives large speedups when used with
    multithreaded task schedulers such as Dask. [#3949]

API Changes
^^^^^^^^^^^

- ``astropy.coordinates``

  - Some transformations for an input coordinate that's a scalar now correctly
    return a scalar.  This was always the intended behavior, but it may break
    code that has been written to work-around this bug, so it may be viewed as
    an unplanned API change [#3920]

- ``astropy.visualization``

  - The ``astropy_mpl_style`` no longer sets ``interactive`` to ``True``, but
    instead leaves it at the user preference.  This makes using the style
    compatible with building docs with Sphinx, and other non-interactive
    contexts. [#4030]

Bug Fixes
^^^^^^^^^

- ``astropy.coordinates``

  - Fix bug where coordinate representation setting gets reset to default value
    when coordinate array is indexed or sliced. [#3824]

  - Fixed confusing warning message shown when using dates outside current IERS
    data. [#3844]

  - ``get_sun`` now yields a scalar when the input time is a scalar (this was a
    regression in v1.0.3 from v1.0.2) [#3998]

  - Fixed bug where some scalar coordinates were incorrectly being changed to
    length-1 array coordinates after transforming through certain frames.
    [#3920]

  - Fixed bug causing the ``separation`` methods of ``SkyCoord`` and frame
    classes to fail due to infinite recursion [#4033]

  - Made it so that passing in a list of ``SkyCoord`` objects that are in
    UnitSphericalRepresentation to the ``SkyCoord`` constructor appropriately
    yields a new object in UnitSphericalRepresentation [#3938]

- ``astropy.cosmology``

  - Fixed wCDM to not ignore the Ob0 parameter on initialization. [#3934]

- ``astropy.io.fits``

  - Reading memmaped scaled images won't fail when
    ``do_not_scale_image_data=True`` (that is, since we're just reading the
    raw / physical data there is no reason mmap can't be used). [#3766]

  - Fixed crash when updating data in a random groups HDU opened in update
    mode. [#3730]

  - Fixed incorrect checksum / datasum being written when re-writing a scaled
    HDU (i.e. non-trivial BSCALE and/or BZERO) with
    ``do_not_scale_image_data=False``. [#3883]

  - Fixed stray deprecation warning in ``BinTableHDU.copy()``. [#3789]

  - Better handling of the ``BLANK`` keyword when auto-scaling scaled image
    data.  The ``BLANK`` keyword is now removed from the header after
    auto-scaling is applied, and it is restored properly (with floating point
    NaNs replaced by the filler value) when updating a file opened with the
    ``scale_back=True`` argument.  Invalid usage of the ``BLANK`` keyword is
    also better warned about during validation. [#3865]

  - Reading memmaped scaled images won't fail when
    ``do_not_scale_image_data=True`` (that is, since we're just reading the raw
    / physical data there is no reason mmap can't be used). [#3766]

  - Fixed a reference cycle that could sometimes cause FITS table-related
    objects (``BinTableHDU``, ``ColDefs``, etc.) to hang around in memory
    longer than expected. [#4012]

- ``astropy.modeling``

  - Added missing default values for ``Ellipse2D`` parameters. [#3903]

  - Improved support for pickling of compound models, including both compound
    model instances, and new compound model classes. [#3867]

- ``astropy.table``

  - Added missing default values for ``Ellipse2D`` parameters. [#3903]

- ``astropy.time``

  - Fixed iteration of scalar ``Time`` objects so that ``iter()`` correctly
    raises a ``TypeError`` on them (while still allowing ``Time`` arrays to be
    iterated). [#4048]

- ``astropy.units``

  - Added frequency-equivalency check when declaring doppler equivalencies
    [#3728]

  - Define ``floor_divide`` (``//``) for ``Quantity`` to be consistent
    ``divmod``, such that it only works where the quotient is dimensionless.
    This guarantees that ``(q1 // q2) * q2 + (q1 % q2) == q1``. [#3817]

  - Fixed the documentation of supported units to correctly report support for
    SI prefixes.  Previously the table of supported units incorrectly showed
    several derived unit as not supporting prefixes, when in fact they do.
    [#3835]

  - Fix a crash when calling ``astropy.units.cds.enable()``.  This will now
    "set" rather than "add" units to the active set to avoid \ 
the namespace
    clash with the default units. [#3873]

  - Ensure in-place operations on ``float32`` quantities work. [#4007]

- ``astropy.utils``

  - The ``deprecated`` decorator did not correctly wrap classes that have a
    custom metaclass--the metaclass could be dropped from the deprecated
    version of the class. [#3997]

  - The ``wraps`` decorator would copy the wrapped function's name to the
    wrapper function even when ``'__name__'`` is excluded from the ``assigned``
    argument. [#4016]

- Misc

  - ``fitscheck`` no longer causes scaled image data to be rescaled when 
    adding checksums to existing files. [#3884]

  - Fixed an issue where running ``import astropy`` from within the source
    tree did not automatically build the extension modules if the source is
    from a source distribution (as opposed to a git repository). [#3932]

  - Fixed multiple instances of a bug that prevented Astropy from being used
    when compiled with the ``python -OO`` flag, due to it causing all
    docstrings to be stripped out. [#3923]

  - Removed source code template files that were being installed
    accidentally alongside installed Python modules. [#4014]

  - Fixed a bug in the exception logging that caused a crash in the exception
    handler itself on Python 3 when exceptions do not include a message.
    [#4056]