Drizzlepac

=====================

- Fixed a bug introduced in release v2.1.15 in the logic for merging WCS due to
which custom WCS scale was being ignored.

====================

- ``fits.io`` operations will no longer use memory mapping in order
to reduce the number of file handles used when running either
``astrodrizzle`` or ``tweakreg``. See
`issue 39 <https://github.com/spacetelescope/drizzlepac/issues/39>`_
for more details.

- Fixed bugs and improved the logic for merging WCS that is used to define
``astrodrizzle``'s output WCS.

- Added ``crpix1`` and ``crpix2`` parameters to custom WCS.

====================

- Supressed info messages related inconsistent WCS - see
`issue 60 <https://github.com/spacetelescope/drizzlepac/pull/60>`_ and
`stwcs issue 25 <https://github.com/spacetelescope/stwcs/issues/25>`_
for more details.

====================

- Fixed a bug due to which sky background was subtracted by ``astrodrizzle``
from the images even though ``skysub`` was set to `False` when
``MDRIZSKY`` was already present in input images' headers.

====================

- ``astrodrizzle`` now will run ``updatewcs()`` on newly created images
when necessary, e.g., after converting WAVERED FITS to MEF format
(``*c0f.fits`` to ``*_c0h.fits``) or after unpacking multi-imset STIS
``_flt`` files. See
`PR 56 <https://github.com/spacetelescope/drizzlepac/pull/56>`_ for
more details.

- Fixed a bug that was preventing processing STIS image data.

- Fixed a bug in reading user input (see
`issue 51 <https://github.com/spacetelescope/drizzlepac/issues/51>`_).

====================

Bug fix release (a bug was introduced in v2.1.10).