If Nickel is not stopped, it interferes with Koreader.
The sleep function kicks in after the set time and it will freeze koreader.
Pulling the power switch gives back control momentarily, but it changes to standby within tens of seconds.
Kobo Aura Hd and Mini users get the error message:
/luajit: ./frontend/ui/gesturedetector.lua:84: attempt to concatenate field 'y' (a nil value)

Hopefully the use of the "," in the DEBUG function instead of the string concatenate operator gets rid of it.
Merge pull request #397 from Markismus/MultitouchKoboAura

Two small changes to improve use for Kobo ereaders