1.0.7	2009-08-28
	try to make the analysis more robust
	(add bottom sentinel line and don't go beyond the right edge)

1.0.6	2009-04-01
	add bubbles/sec display

1.0.5	2009-01-07
	fix a bug where recording start did not zero/release
	prevoiusly recorded blocks

1.0.4	2008-09-29
	use median of 9 frames for calibration

1.0.3	2008-02-01