Modified checksum algorithm to process buffers 2880 bytes at a time to prevent internal overflows,  CNSHD796392
Modified checksum algorithm to process buffers 2880 bytes at a time to prevent internal overflows,  CNSHD796392

git-svn-id: 5305e2c1a78737cf7dd5f8f44e9bbbd00348fde7@688 ed100bfc-0583-0410-97f2-c26b58777a21

spacetelescope/PyFITS,spacetelescope/PyFITS,embray/PyFITS,embray/PyFITS,embray/PyFITS,embray/PyFITS