Healpy

* Fixed bug in polarization rotation in `hp.Rotator.rotate_map` https://github.com/healpy/healpy/pull/459
* Fixed packaging issue: Add six to `setup_requires` https://github.com/healpy/healpy/pull/457

* New `hp.Rotator.rotate_map` function to change reference frame of a full map https://github.com/healpy/healpy/pull/450
* Implementation of pixel weights for map2alm that makes transform exact https://github.com/healpy/healpy/pull/442
* Change default output FITS column names to agree with other HEALPix packages https://github.com/healpy/healpy/pull/446
* Reformatted the Python code with black, this made a huge changeset https://github.com/healpy/healpy/pull/454

* Remove NSIDE restriction to be a power of 2 for RING https://github.com/healpy/healpy/pull/377
* Implement Coordsys2euler zyz https://github.com/healpy/healpy/pull/399
* Return multiple maps as a single 2D array instead of a tuple of 1D arrays https://github.com/healpy/healpy/pull/400
* Support for galactic cut in anafast and map2alm https://github.com/healpy/healpy/pull/406
* Change in write_map default behavior: https://github.com/healpy/healpy/pull/379 and https://github.com/healpy/healpy/pull/386

* Removed support for Python 2.6
* Implemented Lambert azimuthal equal-area projection https://github.com/healpy/healpy/pull/354
* Bugfix: write multiple alms https://github.com/healpy/healpy/pull/342
* Depend on `astropy` instead of `pyfits` https://github.com/healpy/healpy/pull/337

Release 1.9.1, 17 Nov 2015, Last version to support Python 2.6

* Remove C++ 11 features https://github.com/healpy/healpy/pull/297
* Streamlined setup.py https://github.com/healpy/healpy/pull/298
* Plotting fixes for Python 3 https://github.com/healpy/healpy/pull/303, https://github.com/healpy/healpy/pull/304
* Numpy 1.10 fix https://github.com/healpy/healpy/pull/305

* updated healpix CXX to 786 (trunk) https://github.com/healpy/healpy/pull/280
* drop support for Python 2.6 https://github.com/healpy/healpy/pull/268
* option to read all fields with `read_map` https://github.com/healpy/healpy/pull/258
* `write_map` and `read_map` support for partial sky maps https://github.com/healpy/healpy/pull/254
* Allow `read_map` to also take an HDUList or HDU instance https://github.com/healpy/healpy/issues/249

* Renamed `get_neighbours` to `get_interp_weights` https://github.com/healpy/healpy/issues/240
* Updated HEALPix C++ to fix bug in `query_disc` https://github.com/healpy/healpy/issues/229