PROTON-723: allow incoming link to coordinator to be detected

git-svn-id: https://svn.apache.org/repos/asf/qpid/proton/branches/examples@1634572 13f79535-47bb-0310-9956-ffa450edef68
PROTON-730: allow transactional state on incoming transfer to be detected and read

git-svn-id: https://svn.apache.org/repos/asf/qpid/proton/branches/examples@1634573 13f79535-47bb-0310-9956-ffa450edef68
Fix to the way in which transactional state is sent on transfers and dispositions

git-svn-id: https://svn.apache.org/repos/asf/qpid/proton/branches/examples@1634575 13f79535-47bb-0310-9956-ffa450edef68