.Save(): Deal with failure to marshal the new config file, trying to

resurrect the old one and then reraising the error.  (Just before he
left for the Usenix conference, John encountered a partition filling
with a large config.db, and the old config.db not being resurrected.)

I created a little utility function to move a file aside and
optionally create a new one - this (aside_new()) may belong in Utils,
if it's useful elsewhere.  We're all in minimal-time mode, so that'll
have to wait...

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