cardio-report2array should support reading from stdin.

[msiebuhr]

That would permit cardio <whatever> | cardio-report2array.

Alternately, we should just move the logic of cardio-report2array into cardio, so it would have the array-style output as the default one.

[msiebuhr]

After talking to @papandreou about it, we should probably just build this into cardio.

Then have a switch on the form --format=object/list/ASCII or just --object/--list/--ascii. (So we deliver the current output, cardio-report2array's output and ditto in an ASCII version, respectively).