Changes in version 1.15:

'-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).

'-h' now prints a short help screen containing only the command-line
options. For full help, use '--help'.

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