Sean D'Epagnier authored Mar 10, 2014 and Brad King committed Mar 14, 2014

Add a CPACK_DEBIAN_COMPRESSION_TYPE option to set the compression type.
Default to 'gzip' to preserve existing behavior.  Use "cmake -E tar"
for 'gzip', 'bzip2', and 'none'.  Use system "tar" for 'lzma' and 'xz'.