What are we up to?

[AlexB]

The hijacker feature is fully documented in its branch, and the docs should be up to date. I'll port it to the new format when time comes.
CanDrive and VehicleThief are not the same. Drivers can only enter vehicles made neutral by using the KillDriver logic. The VehicleThief can only steal neutral vehicles as long as the driver has not been killed by KillDriver.

The branch fixes 8 (IIRC) additional bugs, like hijackers never escaping when a unit is destroyed in 0.1, PilotCount not working, spawning with parachute on slopes, and several hijacker and mindcontrol interaction problems.