core: added basic chain configuration

Added chain configuration options and write out during genesis database
insertion. If no "config" was found, nothing is written to the database.

Configurations are written on a per genesis base. This means
that any chain (which is identified by it's genesis hash) can have their
own chain settings.

core/vm/jit_test.go

@@ -84,7 +84,7 @@ func TestCompiling(t *testing.T) {
 func TestResetInput(t *testing.T) {
 	var sender account
 
-	env := NewEnv()
+	env := NewEnv(false, true)
 	contract := NewContract(sender, sender, big.NewInt(100), big.NewInt(10000), big.NewInt(0))
 	contract.CodeAddr = &common.Address{}
 
@@ -143,10 +143,7 @@ func runVmBench(test vmBench, b *testing.B) {
 	if test.precompile && !test.forcejit {
 		NewProgram(test.code)
 	}
-	env := NewEnv()
-
-	EnableJit = !test.nojit
-	ForceJit = test.forcejit
+	env := NewEnv(test.nojit, test.forcejit)
 
 	b.ResetTimer()
 
@@ -168,12 +165,16 @@ type Env struct {
 	evm      *EVM
 }
 
-func NewEnv() *Env {
+func NewEnv(noJit, forceJit bool) *Env {
 	env := &Env{gasLimit: big.NewInt(10000), depth: 0}
-	env.evm = New(env, nil)
+	env.evm = New(env, Config{
+		EnableJit: !noJit,
+		ForceJit:  forceJit,
+	})
 	return env
 }
 
+func (self *Env) RuleSet() RuleSet       { return ruleSet{new(big.Int)} }
 func (self *Env) Vm() Vm                 { return self.evm }
 func (self *Env) Origin() common.Address { return common.Address{} }
 func (self *Env) BlockNumber() *big.Int  { return big.NewInt(0) }