Remote: don't print tracebacks for Error exceptions handled downstream
Remote: don't print tracebacks for Error exceptions handled downstream

(What we'd really want is to have proper exception transporting over
 the RPC)

Fixes #792

edgimar/borg,edgimar/borg,edgewood/borg,edgewood/borg,RonnyPfannschmidt/borg,edgimar/borg,raxenak/borg,edgimar/borg,edgewood/borg,edgewood/borg,raxenak/borg,RonnyPfannschmidt/borg,RonnyPfannschmidt/borg,RonnyPfannschmidt/borg,raxenak/borg,RonnyPfannschmidt/borg,raxenak/borg