Removes uneeded conversions to and from degrees.
Implements clearing the maneuver queue on left/right turn damage.
Adjusted damage to prevent left and right turns being disabled at the same time.
Fixes bug which caused crash when trying to give orders to dead jet.
Fixes bug which allowed a jet to target itself.
Fixes a bug in the remove maneuver from queue command.
Merge pull request #72 from absolom/bugs

Pull Request - Bug Fixes

Closes #51, #52, #53, #55, #56.