Unhide.rb, finder of hidden processes

Unhide.rb is a reimplementation of unhide in Ruby. On 2013jan13, the relationships between the two programs are:
* Unhide.rb does the same checks as "unhide procall" and "unhide sys" plus some more.
* Unhide.rb is about 14x faster than the original C code (7s vs 100s on my system).
* Unhide.rb is only about a tenth as much code (437 lines vs 5100 lines) as the original C code, so it should be easier to maintain / extend.
* Unhide.rb actively tries to avoid false positives when hidden processes are found.

The original unhide can be found here:
http://www.security-projects.com/?Unhide