Add support for hashified/cloned filesystems. This is really only
useful on widearea nodes where we can amortize the time it takes to copy/hash the necessary filesystems, which takes about 15 minutes. We would do this when a node first boots (or its image is updated I guess). Note that the clone operation (when a vserver is actually created) is very fast though, taking about 30 seconds. Currently controlled by local variable $USEHASHIFIED for debugging.
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