After resuming from suspend, all batteries are added to

powerdevil. When a battery, with charge lower or equal than the critical
charge percentage is added, the critical battery timer will be started.

In the current version the critical battery timeout can
only be interrupted by plugging in AC.

But if the system has more than one battery, the global
charge percentage can be greater than the critical charge
percentage and so the system shouldn't suspend. To achive
this behaviour, we calculate the global charge percentage
whenever a new battery was added and if the critical
battery timer is running and the global charge is high
enough, we stop the timer.

Also we use the already calculated global charge percentage
for the battery charge percentage notification instead of
the charge of each individual battery.

With this patch, the user can not only interrupt the critical
timer by plugging in the AC but also by plugging in a new or
additional battery (if the battery has enough charge).

CCBUG: 325707
CCBUG: 329537
BUG: 337414

FIXED-IN: 5.1