TODO for debian package:
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- audit source to make sure kilo is k (not K), mega is M (not m),
  giga is G (not g), bit is b (not B), byte is B (not b) and
  seconds is s (not sec).

- postgresql: support installing a "sensor".
  See dbconfig-common section 3.2.5:
  "Packages that connect to but should not create databases (read-only frontends)"
  http://people.debian.org/~seanius/policy/dbconfig-common-using.html/ch-develguide.html#s-frontends
  (Also remove note from debian/bandwidthd-pgsql.NEWS about sensors not yet
  supported)
