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.
A similar import story happens in tests/ for kronos etc, I wonder how that works.