Commit 0bd1660ae41f6000afd9fe74af4a7a131ef9eb40 in isis's branch refs/heads/
ISIS-1291 from Dan Haywood
[ https://git-wip-us.apache.org/repos/asf?p=isis.git;h=0bd1660 ]
ISIS-1372: extending EventMetadata with a sequenceName, in preparation to CommandMementoService creating different sequences of events (published event, wrapped event, background commands).
Also updated javadoc for Command, and created a constant "(edit)" which is the value of Command#getTargetAction() for property edits.