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Version History:

 1.0 2010-12-04 initial version.

 1.1 2010-12-06 add duty cycle.

 1.2 2010-12-23 fix integer overflow bug for large consumption.

 1.3 2011-05-19 tweak the layout. Add more energy-using items.

 1.4 2013-01-19 add more items, sort by total cost, fix bug that was chopping a 0, polish alignments.

 1.5 2014-06-01 correct bug displaying duration, add cell phone and ipad.

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