miscellaneous +/- (commands, dht, net)

a shared branch of innocuous miscellaneous fixes. Feel free to push. ~~Will be rebased after Dec 1, 01:00 UTC and merged.~~
> Because of this issue, though MC probably shouldn't expose it's underlying Conns. I'm not sure what the design goals are for MC. @jbenet's perspective?

MC doesn't need to expose underlying Conns yet. There may be a need in the future but not here now. either way is fine.