Kronos copier

A script to bulk-load test data into Kronos, and a script to copy data between streams.

NOTE: I think there's a subtle bug in the stream_comparator that forgets the last timestamp up for comparison (after the loop exits).  If I insert 3000 events, the comparator says the stream total is 2999, for example.
There should also be a way to pass in "read-stream" and "write-stream" so that we can copy events to a stream with a different name.