Restore ExcludeEntryNodes feature
Seems that ExcludeEntryNodes configuration option was removed at some point (atleast 0.2.3.15-dev's "verify-config" rejects it).
It however would be nice to have it to avoid the "adversary can monitor entry and exit nodes" scenario which is very real in countries with few relays (which can be legally compelled to do such a thing) while still using the country's exitnodes (I don't have a problem with my traffic making a trip around the world and exiting to public Internet from the relay that my neighbour runs, I do however have a problem with my traffic entering the Tor network from the high-bandwidth relay with a Guard flag that my other neighbour, who happens to be an associate of the first neighbour, is running).