Update documentation

whois(1) options listing has been updated in whois --help output as
well as in manual page.

Rerefence to RIPE WHOIS database query syntax has been updated.
Remove -S option

RIPE-like `-S' option is not documented nor supported by RIPE.
Add whois.conf(5) manual page
Handle --help as success

whois --help output should go to standard output, and exit code should
be zero.
Handle --help as success for mkpasswd too
Undocument the -F RIPE option

It is deprecated, does not always work correctly and nobody should ever
use it anymore.
Add new LACNIC AS numbers
Debian changelog for 5.0.24