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15b8665787
This makes debugging easier, you can pass an AUMHash to a printf and get a string that is easy to debug. Also rearrange how directories/files work in the FS store: use the first two characters of the string representation as the prefix directory, and use the entire AUMHash string as the file name. This is again to aid debugging: you can `ls` a directory and line up what prints out easily with what you get from a printf in debug code. Signed-off-by: David Crawshaw <crawshaw@tailscale.com>