bq2700_battery.c changes and observations

[Sean McNeil]

Attached is a patch to add:

Battery health
USB and AC power indicators
Change to threshold for detecting charge status

The last item is problematical for me. The battery tends to hover at 11 
for BQ27000_AI_L and BQ27000_TTF_L is not zero. This is with 2 usb 
connections - one direct, 1 via debug board - directly into laptop. My 
blackberry complains it doesn't get enough juice under linux, so maybe 
that is the issue. Capacity on the battery is at 100%, though.

Sean

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