Correct error when adding new time bins
Correct error when adding new time bins

The old logic is incorrect.  Firstly, it assumes that the input event
has a time that occurs at or after the timestamp of the last recorded
item.  This means that any events of an earlier time will be incorrectly
added to the last recorded item.  Secondly, if the input event has a
time that occurs more than one resolution step after the last event, it
will get incorrectly added in a time bin exactly one resolution step
away.

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