For Allison Arnold, the secret to self sufficiency lies in one fuzzy word: Angora. The Woodacre farmer, who has been surrounded by rabbits for as long as she can remember, spins the fur of her seven-plus angora rabbits into high-end yarns. She barters their pelts and feeds them to her family of four. She is also part of the Fibershed Project, which connects and promotes Marin County producers and artisans in a bioregionally-based and green…