Hamachi 1.0.2.1

- Modified the driver to work around Comodo firewall's bug of not
coping with zero-checksum'ed UDP packets

- Fixed the crash condition that occurs when starting Hamachi on
computers that have previously run 0.9.x.x versions of Hamachi

- Fixed per-peer preferences sometimes not getting properly saved
when running Hamachi as a service

- Fixed TCP peer-to-peer tunneling sometimes not working between
1.0.2.0 clients