Turning thrusters don't show up on all ships

Originally from fightermedic on mantis http://scp.indiegames.us/mantis/view.php?id=3044

> thrusters do not show up on a ship that doesn't belong to the player's wing, but even then they don't most of the time furthermore, it appears "roll right" and "bank right" are switched in their functionallity, same goes for same goes for the left ones

The roll and bank are switched from standard FSO conventions yes, but fixing that now would really not be viable. More importantly, I can confirm the display issue, and it's rather limiting of some stuff WM would like to do in the future