Issue 78

* unrelated javadoc updates in metadata parser
* added 'rest' to root error context to make clear which instance of command is used (where multiple exist with same simple name)
* updated error creation on generic failure to include full stack trace as message
How about a new issue for that so we can get this out?  The pressing need is to have it reported to the client.  I'm OK with logging as well, but it's probably bigger than just the bits touched for this issue.