adjust TRIM_PITCH_CD up by 5 degrees

def cmd_up(self, args):
        '''adjust TRIM_PITCH_CD up by 5 degrees'''
        if len(args) == 0:
            adjust = 5.0
        else:
            adjust = float(args[0])
        old_trim = self.get_mav_param('TRIM_PITCH_CD', None)
        if old_trim is None:
            print("Existing trim value unknown!")
            return
        new_trim = int(old_trim + (adjust*100))
        if math.fabs(new_trim - old_trim) > 1000:
            print("Adjustment by %d too large (from %d to %d)" % (adjust*100, old_trim, new_trim))
            return
        print("Adjusting TRIM_PITCH_CD from %d to %d" % (old_trim, new_trim))
        self.param_set('TRIM_PITCH_CD', new_trim)