Pre release of 2.1.12

[Alan DeKok]

Alexander Clouter wrote:
> Would be handy to change Acct-Interim-Interval to something like:
> ----
> update reply {
> 	Acct-Interim-Interval := 3000 + %{rand:1200}
> }
> ----

  Cute.  Added.

  Alan DeKok.