Fixes! The new NFS server appears to be more asynchronous, and errors
caused by hupping mountd are not getting propogated back until later writes. Must do an fsync to catch the error. Too many fsyncs slows down imagezip by a factor of three though, so I reorged things so that we create the 1MB chunks all in memory, and then write out each one out as finished. Much better; only a 10% slowdown.
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