[AstroPy] ANN: pywcs 1.11 released

[Michael Droettboom]

A new version of standalone pywcs has been released.  It is available 
from here:

https://trac.assembla.com/astrolib/wiki/WikiStart

Version 1.11
============

NEW FEATURES:

- Updated to wcslib version 4.8.2, which gives much more detailed
   error messages.  Exceptions raised due to invalid WCS keywords
   should now be more informative.

- Undefined values that are the result of p2s and s2p are now set to
   NaN.  Previously, one had to examine the stat result vector to
   determine which results were invalid.

- Added functions get_pc() and get_cdelt().  These provide a way to
   always get the canonical representation of the linear transformation
   matrix, whether the header specified it in PC, CD or CROTA form.

BROADER COMPATIBILITY:

- Supports Python 3.x

- Long-running process will now release the Python GIL to better
   support Python multithreading.

- Builds on Microsoft Windows using mingw32, mingw64 and Visual Studio
   9.0 and 10.0 without severely patching wcslib.

- pywcs will now run without pyfits, though the SIP and distortion
   lookup table functionality is unavailable.

BUG FIXES:

- The dimensions of the cd and pc matrices were formerly always returned
   as 2x2.  They now are sized according to naxis.

MISCELLANEOUS:

- Lots of new unit tests

- Setting wcs.wcs.cunit will now verify that the values are valid unit
   strings.

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