core, core/state, trie: Hardfork EIP155, EIP161, EIP170

This commit implements EIP158 part 1, 2, 3 & 4

1. If an account is empty it's no longer written to the trie. An empty
  account is defined as (balance=0, nonce=0, storage=0, code=0).
2. Delete an empty account if it's touched
3. An empty account is redefined as either non-existent or empty.
4. Zero value calls and zero value suicides no longer consume the 25k
  reation costs.

params: moved core/config to params

Signed-off-by: Jeffrey Wilcke <jeffrey@ethereum.org>

cmd/gethrpctest/main.go

@@ -26,7 +26,6 @@ import (
 
 	"github.com/ethereum/go-ethereum/accounts"
 	"github.com/ethereum/go-ethereum/common"
-	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/eth"
 	"github.com/ethereum/go-ethereum/ethdb"
@@ -130,8 +129,7 @@ func MakeSystemNode(keydir string, privkey string, test *tests.BlockTest) (*node
 	ethConf := &eth.Config{
 		TestGenesisState: db,
 		TestGenesisBlock: test.Genesis,
-		ChainConfig:      &core.ChainConfig{HomesteadBlock: params.MainNetHomesteadBlock},
-		AccountManager:   accman,
+		ChainConfig:      &params.ChainConfig{HomesteadBlock: params.MainNetHomesteadBlock},
 	}
 	if err := stack.Register(func(ctx *node.ServiceContext) (node.Service, error) { return eth.New(ctx, ethConf) }); err != nil {
 		return nil, err