Zc.zservertracelog

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- Nothing changed yet.

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- Fix logic bug in seconds_difference() that could introduce error up to nearly
a whole second for any particular event.

- Limit number precision in HTML reports to 3 decimal digits.

- Drop Python 2.6 support.

- Add Python 3.4 through 3.7 support.

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- tracereport can be limited to a date range with --date=YYYY-MM-DD..YYYY-MM-DD

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- Slight refactoring to allow alternative tracelog implementations.

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- Fix KeyError: 'ZODB.interfaces.IConnection' on requests that do not have
a ZODB connection in annotations (e.g. GET /++etc++process).

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- Added 'D' records providing database transfer counts.
This is somewhat experimental. The tracereport script ignores D
records.