Be more more aggressive about killing cycles in server code
Be more more aggressive about killing cycles in server code

nmathewson/mixminion,nmathewson/mixminion,crooks/mixminion,reezer/mixminion,Javex/mixminion,crooks/mixminion,mixminion/mixminion,nmathewson/mixminion,mixminion/mixminion,Javex/mixminion,mixminion/mixminion,mixminion/mixminion,crooks/mixminion,reezer/mixminion,rxcomm/mixminion,reezer/mixminion,Javex/mixminion,rxcomm/mixminion,rxcomm/mixminion,Javex/mixminion,reezer/mixminion,nmathewson/mixminion,rxcomm/mixminion,crooks/mixminion