DeadReckoner:perform_DR() for (some) articulated parts not working

[LumHwang]

We are using articulated parts parameters:

1. Turret Azimuth
   PRIMARY_TURRET_NUMBER_1 + AZIMUTH
2. Gun Elevation (attached to turret)
   PRIMARY_GUN_NUMBER_1 + ELEVATION

When perform_DR() is called on those parts, the values produced for turret Azimuth seem correct at certain angles, but at other angles, the values flip/flop (even when there is no movement).

In the end, I think that dead-reckoning for those parts should be disabled.

[leif81]

Thank-you for the report @LumHwang . Will await confirmation the change passed lab testing and then will proceed with merging the PR.