MessageProperties is currently defined in Frame::Content, which makes it
cumbersome to use when working directly with a Message itself. I attempted
to make this easier by using typedefs, but it's become pretty obvious that
it belongs in the Message class itself.
- add publish options to Exchange (these need to move to a Basic abstraction)
- listen for bmReturn in Exchange to catch errors
- added auto tests to check behavior of an invalid mandatory publish
- cleaned up bit fields in exchange and queue
Matt Broadstone