Changes on 09-18-15:

• Implemented the ability to edit the text of an already written letter if you're using the flexible editor.
• Added a FIND command to the flexible editor interface.
• Added an upgrade that allows one to reconfigure the drive order that's used by NAVI. Access with DRIVE-ORDER from a starship control room, or DRIVE-O for short.
• Simulated building avatars now have the ability to DEMOLISH enter exits.
• The repairall command in starship simulators now repairs structural damage.
• You can now change the door type for biometric entrances in simulated houses by typing DOORTYPE <door name>.