| 1234567 |   o Minor features:    - Improve the circuit queue out-of-memory handler. Previously, when      we ran low on memory, we'd close whichever circuits had the most      queued cells. Now, we close those that have the *oldest* queued      cells, on the theory that those are most responsible for us      running low on memory. Based on analysis from a forthcoming paper      by Jansen, Tschorsch, Johnson, and Scheuermann. Fixes bug 9093.
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