------------- - Add CHANGES.md - Add boolean mask operations (and, or, xor, invert). - When setting pixels with None, do not expand the coverage mask. - Add get_valid_pixels_per_covpix() and valid_pixels_single_covpix() to save memory when computing valid_pixels in chunks.
1.8.0
------------- - Add bit-packed masks for efficient representation of boolean maps in memory. - Change to RICE compression for integer maps in FITS. - Use section API in astropy for faster tile reading. - Add support for reshaping very large compressed images persisted in FITS.