Add overhead/efficiency graph

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 Use erasure codes (par2) to use storage more efficiently than `numcopies`.
 
 ![parity](annex-ec/blob_plain/HEAD:/parity.png)
+
+More drives → better efficiency:
+
+![overhead](annex-ec/blob_plain/HEAD:/overhead.png)

diff --git a/overhead.png b/overhead.png
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Binary files /dev/null and b/overhead.png differ