partition() should have an argument to include the summary as a frame

[michaelquinn32]

This should work in the new summary interface #624. It should also make behavior nicer when writing out results. #665

[michaelquinn32]

This might also help us solve #671

[elinw]

When you are thinking about having it as a frame, are you seeing each of the current elements of the list as a column? Or are you thinking vertical?