o Minor bugfixes (fallbacks): - Make sure fallback directory mirrors have the same address, port, and relay identity key for at least 30 days before they are selected. Fixes bug 20913; bugfix on 0.2.8.1-alpha. - Decrease the guard flag average required to be a fallback. This allows us to keep relays that have their guard flag removed when they restart. Fixes bug 20913; bugfix on 0.2.8.1-alpha. - Decrease the minimum number of fallbacks to 100. Fixes bug 20913; bugfix on 0.2.8.1-alpha.