Stwcs

-------------------

- The ``clobber`` parameter in `Headerlet.tofile()`` was replaced with
``overwrite``. [24]

- Fixed a python compatibility bug. [30]

- Warning messages from astropy.wcs are filtered out when they are not relevant. [31]

----------------

- updatewcs() now reads all extension immediately after opening a file
to fix a problem after astropy implemented fits lazy loading. [21]

- Fixed a bug in updating the D2IM correction in a science file when the
a new distortion file was supplied through D2IMFILE keyword. [22]

------------------

- Fix a bug in removing LookupTable distortion. [3]

- Fix a ``KeyError`` crash in applying headerlets. [9]

- Catch ``KeyError`` when deleting header keywords. [13]

- Fix for ``REFFRAME = OTHER``. [14]

- In cases when the warning is expected, catch INFO messages
coming from `astropy.wcs`. [16]

------------------

- Move to github.