Send view errors to pathGenerator requests.
Abort pathGenerator error delivery on client close.
Pass at cbfs backups in cbfs.

I think I need to optimize the path listing some (for 175,219 files here):

    2013/03/17 22:28:50 Completed backup in 13m19.320186091s

Also, I need to externalize the reference some so I can find it
again.  Maybe do restore.  And perhaps some way to freeze gc so we
don't lose all the items after a restart.