o Minor bugfixes: - Simplify the logic that causes us to decide if the network is unavailable for purposes of recording circuit build times. If we receive no cells whatsoever for the entire duration of a circuit's full measured lifetime, the network is probably down. This should hopefully reduce some of the cases where we see ridiculous circuit build timeouts for people with spotty wireless connections. Fixes bug 1772; bugfix on 0.2.2.2-alpha. - Prevent the circuit build timeout from becoming larger than the maximum build time we have ever seen. Also, prevent the measurement time period from becoming larger than twice that value. Fixes bug 1772; bugfix on 0.2.2.2-alpha