Need ability to format a list of segments

[ahives]

We need the ability to format a query or message out into a text string. In the case of segments coming from queries, it should not require an MSH segment to be present. This functionality should also allow for other formats as well. We will add different formatters as we go.

We cannot depend on defined segments such as PID. We need be able to process HL7Segment because we will get unknown segments from time to time.