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trace: Improve/fix add_events_deltas()

Darryl Green requested to merge github/fork/valschneider/trace/deltas_with_diff into next

Created by: valschneider

While we're not supposed to get duplicate timestamps (see trappy.utils::handle_duplicate_index), these seem to still happen and they throw pandas.DataFrame.loc[] off balance.

Use diff() + shift() instead of handcrafted equivalents. Performance difference is insignificant, but at least we rely on a standard pandas API.

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