command line script for converting logs to JSON
Change parsed time series rows from objects to arrays.

I hate to do this, it makes the API awkward (row[0] instead of row.time).
But I plan to use the JSON for this object a wire format, and the savings
are significant.

Real world test on the size of the JSON output for a log file
Old bloated format. gzip: 9150 raw: 67394
Terse object names (t instead of time). gzip: 8498 raw: 36146
These unnamed arrays. gzip: 6797 raw: 16895

If this new API gets too annoying, make the time series row objects proper
objects with accessor functions. Or else define custom serialization.