Changes in version 1.13:

'-dvv' and '-tvv' now print (de)compressed sizes instead of compression
ratio. (Sizes are more informative than compression ratio).

Large numbers in option arguments are now accepted with underscore
separators (-s 123_456_789).

Large numbers are now printed with underscore separators (123_456_789).

By default, '--help' now prints a short help screen containing only the
command-line options. For full help, call plzip with options '-v --help'.

'--list' now can safely skip any trailing data added to a lzip file by the
option '--append' of lziprecover.

'--list' now prints '+t' after the number of members to indicate the
presence of trailing data, and prints the size of the trailing data below
the size of the last member.

'-lvv' now prints a blank line between the list of members of each
multimember file and the next file.

'EXIT STATUS' now has its own section in the man page.
