Use custom chains

Simplify logic by creation our own chains and reset them
every time we read counters.

This way we don't need to worry about deltas or counter
resets.

Signed-off-by: Martin Abente Lahaye <tch@sugarlabs.org>
Release 0.2.0-1

Signed-off-by: Martin Abente Lahaye <tch@sugarlabs.org>