accelerometer does not work as non-root on Maemo

The function n900accelerometer::start() tries to write to /sys/class/i2c-adapter/i2c-3/3-001d/scale and /sys/class/i2c-adapter/i2c-3/3-001d/rate and fails, since these are only writable by root. The error makes the start() call fail and the sensor doesn't generate any readings.