Log Message:
- Update nessus to 2.2.0
- ok'ed frueauf
- specify local state directory
- make the update script work using netbsd's ftp client by default

Local security checks over SSH : Nessus can now log into the remote hosts
to determine their patch levels and missing updates

A rewritten internal knowledge base API : the new knowledge base API makes
KB access faster and lets the plugins store any amount of data

An improved internal communication between the various nessusd processes, thus
reducing the overhead it takes to handle the results of the plugins and pass
them to the client

An improved plugin scheduler which reduces the time Nessus needs to organize
the order in which plugins should be launched

Sensitive scripts (which can execute commands over SSH) are cryptographically
signed