Drizzlepac

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

**available starting:** Feb 11, 2013

- Fixed a bug in ``astrodrizzle`` which caused blot to raise an exception
when using 'sinc' interpolation.

- Cleaned up the logic for writing out the results from the pixtopix, pixtosky,
and skytopix tasks to avoid an Exception when a list of inputs are provided
and no output file is specified.

- A new parameter was added to the tweakback task to allow a user to specify
the value of ``WCSNAME`` when updating the FLT images with a new solution
from a DRZ image header.

- Code in tweakback for updating the header with a new WCS will now
automatically generate a unique ``WCSNAME`` if the there is a WCS solution in
the FLT headers with the default or user-defined value of ``WCSNAME``.

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

**available starting:** Jan 14, 2013

- Bug fixed in updatehdr module to allow shiftfiles without RMS columns to work
as inputs to manually apply shifts to headers of input images.

- Revised ``astrodrizzle`` to update WCS of all input images BEFORE checking
whether or not they are valid. This ensures that all files provided as input
to ``astrodrizzle`` in the pipeline have the headers updated with the
distortion model and new WCS.

- Images with NGOODPIX=0 now identified for WFC3 and WFPC2 inputs, so they
can be ignored during ``astrodrizzle`` processing.
- Replaced 2d histogram building code originally written in Python with
a C function that run about 4x faster.

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

**available starting:** Dec 10, 2012

- ``tweakreg`` v1.1.0 source finding algorithm now runs many times faster
(no algorithmic changes). No changes have been made yet to speed
up the 2d histogram source matching code.

- The 'pixtopix' task was updated to make the 'outimage' parameter optional
by using the input image as the default. This required no API changes, but
the help files were updated.

- Very minor update to guard against MDRIZTAB being specified without
any explicit path.

- Update ``astrodrizzle`` to correctly report the exposure time,
exposure start, and exposure end for the single drizzle products,
in addition to insuring the final drizzle values remain correct.

- ``astrodrizzle`` also includes initial changes to safeguard the C code
from getting improperly cast values from the configObj(TEAL) input.

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

**available starting:** Oct 29, 2012

- Scaling of sky array for WFC3/IR IVM generation now correct.

- template mask files for WFPC2 no longer generated so that WFPC2 data can now
be processed using num_cores > 1 (parallel processing).

- interpretation of the 'group' parameter fixed to support a single integer,
a comma-separated list of integers or a single 'sci,<n>' value. The values
correspond to the FITS extension number of the extensions that should be
combined. This fix may also speed up the initialization step as more direct
use of pyfits was implemented for the interpretation of the 'group'
parameter.

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

**available starting:** Sept 24, 2012

- Bug fixed to allow use of final_wht_type=IVM for processing WFPC2 data.

- Revised Initialization processing to speed it up by using more up-to-date,
direct pyfits calls.

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

**available starting:** Sept 17, 2012

- Fixed the logic so that crclean images always get created regardless of the
value of the 'clean' parameter.