Subject: Include the Debian version in our identification
This makes it easier to audit networks for versions patched against security
vulnerabilities. It has little detrimental effect, as attackers will
generally just try attacks rather than bothering to scan for
vulnerable-looking version strings. (However, see debian-banner.patch.)
A disappointing number of servers happily give away this information in their http response headers. For those that don't, `nmap -O` will sometimes do the trick.
