review: document the idempotence of runOutput and runLines

Change-Id: I728576a2be2dd33ff2fefb02b64ae28cea108f79
review: add todo

Change-Id: I8b9cb53be5852adab4598860af28b53388e963b6
review: add another todo

Change-Id: I4b14ea62f2525824108dc8cf44330f3b8b01736c
Reviewed-on: https://go-review.googlesource.com/1083
Reviewed-by: Andrew Gerrand <adg@golang.org>
review: add flags for upload, including -r and -cc

Change-Id: I01590867ff89dc49e9d3401a68c88ada9ac75192
Reviewed-on: https://go-review.googlesource.com/1082
Reviewed-by: Andrew Gerrand <adg@golang.org>