[Ovmsdev] Motor temp does not support negative numbers (car_tmotor)

Hi (Mark).

In ovms.h the motor temperature is defined as unsigned char (non-negative): extern unsigned char car_tmotor; // Tmotor

Currently the weather is cold in Norway (-15 C) and I noticed that motor temp was 244C.

Is it possible to update the car_tmotor to extern signed char car_tmotor; // Tmotor in ovms.h?

Best regards Håkon