Changes in version 1.13:

Decompression time has been reduced by 5-12% depending on the file.

In case of error in a numerical argument to a command line option, clzip
now shows the name of the option and the range of valid values.

Several descriptions have been improved in manual, '--help', and man page.

The texinfo category of the manual has been changed from 'Data Compression'
to 'Compression' to match that of gzip. (Reported by Alfred M. Szmidt).