Add a docking behaviour for the priority AI
New JS methods for ship, update priority lib

ship.checkCourseToDestination()
ship.getSafeCourseToDestination()
AILib: handle cascade mines, basic group combat, some cleanup
ship.checkScanner()

Fast scanner checking routine. Returns at most 16 nearby ships.
Bounty hunter AI in JS
More ship properties/methods

ship.isFleeing
ship.removeDefenseTarget(target)
ship.checkScanner()
Add escortAI, update and debug AI library, system.stations property