-added verification of the GpsAgeFix (that field is reported only when the fix is older that 5
seconds)
- changed the assertion message in speeding fields verification (that was wrong before)
- removed tolerance in speeding assertions (that was wrong before)
- moved comments outside TCs (according to Ldoc)

- added two new TCs:
* test_Moving_WhenSpeedAboveThldForPeriodAboveThld_MovingStartMessageSentGpsFixAgeReported
(verification of the GpsFixAge field in the report for fixes older than 5 seconds)
* test_Speeding_WhenSpeedAboveThldForPeriodBelowThld_SpeedingStartMessageNotSent

- moved the setting of gpsReadInterval to the setup function (before that was in the suite_setup function) - that is to make sure the interval is always set before each TC (it is likely that the gpsReadInterval property will be modified in the future developed TCs)