REV LED issues

[LAtimes2]

1. isLightOn is reversed for REV LED - returns true when LED is off, false when on
2. REV LED is on after stopping opMode - At reset, the REV LEDs are off (digital channel is probably in input mode). After running an opMode, any digital channels that are configured as a REV LED are set to low but still in output mode, which leaves the LEDs on. I would recommend setting digital channels back to input upon exit of the opMode.