Changes in version 1.5:

Codification of dictionary size in file header has been changed. At
least lzip 1.4 is needed to decompress files produced by lzip 1.5.

"--member-size" and "--volume-size" have been made more accurate.

Compression ratio and speed have been improved at the cost of 4MiB more
of RAM.

The chapter "Algorithm" has been added to the manual.

Lzdiff and lzgrep now accept "-h" for "--help" and "-V" for "--version".
