`cin_delta` / `cout_delta` should be extended to 64bit
Our FTTH stats show up as capped around 100Mbps. This is apparently simply coming from
cout_delta being 32bit: with a report every 5 minutes, that's 4GiB/5minutes ~= 100Mbps.
cout_delta should thus be extended to 64bit integers, to handle accounting with nowadays bandwidths :)
That doesn't seem completely trivial since the
sessiont structure is shared in clusters and a version number seems to be used to automatically convert, see
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