12/22/11 Changelog

• added a fuel tank display when in a vehicle cockpit or looking at it from the exterior
• worked on sector center building interior - about 30% finished
• replaced expiring sub sectors with expiring buildings - reduces pain in my neck and allows easier random dungeon generation
• skillpoint awards now display name of skill awarding the skillpoints
• several minor fixes and improvement to skillpoint awards and skill success rolls
• background selection and reroll fixes