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And changed amount of data created by dummy data script.

A small size probably indicates an error in occurring in the query on
the server.

Stops thread error messages.

Having that delay will inflate the estimate of the post rate for the
period the query was occurring.

Many settings were already named that way, but a few weren't.

To get server info for performance testing recording.

Had errors when trying to migrate the and even initialize the test
server.  Indications are that SQLite is buggy as a main Django database.

Also added a new multi-building chart type skeleton for showing sensor
values across multiple buildings.

Lots of Sensor IDs are numbers but need to be converted to strings for
database operations.  Cleaned up the reading database class to ensure
they are converted to strings.

And restricted count of inserted readings to be before the current time.