patchbomb: make it easy for the user to decline sending an intro message. - prompt(): respect interactive mode; clarify logic a bit - rename introneeded() to introwanted() and give it only one caller - add 'numbered' arg to makepatch() so it does not need to call introwanted() - factor makeintro() out of getpatchmsgs(), so it's easier to skip the intro message based on the user's behaviour Unexpected but perfectly reasonable side effect: in non-interactive mode, we don't show unanswerable "Cc" or "From" prompts anymore, so remove those from the test expectations.