Added chain tests & minor fixes

* Fork tests (equal and larger chains)
* `chain.link` fields are now exported
* moved debug function from state to dump.go

state/dump.go

@@ -46,3 +46,11 @@ func (self *State) Dump() []byte {
 
 	return json
 }
+
+// Debug stuff
+func (self *StateObject) CreateOutputForDiff() {
+	fmt.Printf("%x %x %x %x\n", self.Address(), self.State.Root(), self.balance.Bytes(), self.Nonce)
+	self.EachStorage(func(addr string, value *ethutil.Value) {
+		fmt.Printf("%x %x\n", addr, value.Bytes())
+	})
+}