CoDel: wireless-friendly adaptive queue management

This is a new algorithm to fight bufferbloat by Kathleen Nichols and Van Jacobson. It has no tunables, and is able to adapt to bandwidth changes of two orders on magnitude, making it suitable for radio links (3G, WiFi).

Patches for the CeroWrt home router are being tested: https://gettys.wordpress.com/2012/05/08/fundamental-progress... Via https://lwn.net/Articles/496250/