Modify IncomingDataPoints.addPointInternal() to accept millisecond timestamps
so users can bulk import data. Also disabled the data point tracking code that
was meant for pre-compacting data during imports. That can be added later.
Modify IncomingDataPoints.addPoint() to support variable length integers
instead of forcing everything to 8 bytes.
Modify the Text Importer unit tests to validate the variable length and
millisecond timestamps.