Use common.Address type for accounts.Address

accounts/account_manager.go

cmd/geth/admin.go

cmd/geth/js.go

cmd/geth/main.go

cmd/mist/gui.go

crypto/crypto.go

crypto/key.go

crypto/key_store_passphrase.go

crypto/key_store_plain.go

eth/backend.go

xeth/xeth.go