First draft of power testing circuit schematic
Fleshed out power testing circuit. It is still missing a few things, and
I don't understand every little bit of it, but it probably won't look a
lot different when it's done. Added some passive components on the
battery charger and pushbutton controller. Added an LDO between that and
the AVR. Hooked up the pushbutton controller interrupt output and kill
input to the AVR.