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/jump_table_test.go

@@ -3,20 +3,16 @@ package vm
 import (
 	"math/big"
 	"testing"
-
-	"github.com/ethereum/go-ethereum/params"
 )
 
 func TestInit(t *testing.T) {
-	params.HomesteadBlock = big.NewInt(1)
-
-	jumpTable := newJumpTable(big.NewInt(0))
+	jumpTable := newJumpTable(ruleSet{big.NewInt(1)}, big.NewInt(0))
 	if jumpTable[DELEGATECALL].valid {
 		t.Error("Expected DELEGATECALL not to be present")
 	}
 
 	for _, n := range []int64{1, 2, 100} {
-		jumpTable := newJumpTable(big.NewInt(n))
+		jumpTable := newJumpTable(ruleSet{big.NewInt(1)}, big.NewInt(n))
 		if !jumpTable[DELEGATECALL].valid {
 			t.Error("Expected DELEGATECALL to be present for block", n)
 		}