+- Kludge around problem with Netgear DM602 authentication.
+- Add session/idle timeouts (Graham Maltby).
+- Use result code AVP to set Acct-Terminate-Cause is disconnect cause
+ AVP is not present.
+- Add radius_bind_{min,max} to simplify firewalling of RADIUS ports.
+- Fix sign problem with reporting of unknown RADIUS VSAs.