Improve Battery Monitor with multiple batteries:
- Show Battery Name, if available, instead of just Battery 1, Battery 2,
- Don't add non-power-supply batteries to the overall percentage
- Drop "Show battery status for each battery", it is now always on,
given that in systray it only shows one icon anyway and now does that
right, and if there's a mouse you wouldn't want it to be not shown,
so it would show them anyway which is a contradiction to the setting

REVIEW: 110431