Always show timezone

[travisspencer]

It would be nice if the timezone was always shown, even if it's just a Z to indicate that the time is in UTC.

For instance, given this log message:

{"dateTime":"2016-10-28T10:00:36+02:00", ... }

And the audit format defined here, lnav shows the time like this:

2016-10-28T10:05:45.000 ...

What timezone is that in though? To determine this, one has to view the file with a different tool. It would better to indicate this by adding a Z to the timestamp if it's in UTC or add an offset, like in the original message.

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