core, core/state, trie: EIP158, reprice & skip empty account write

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>

1 files changed, 3 insertions, 2 deletions

diff --git a/core/database_util_test.go b/core/database_util_test.go
index ab14ae156..83750aa60 100644
--- a/core/database_util_test.go
+++ b/core/database_util_test.go
@@ -30,6 +30,7 @@ import (
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/crypto/sha3"
 	"github.com/ethereum/go-ethereum/ethdb"
+	"github.com/ethereum/go-ethereum/params"
 	"github.com/ethereum/go-ethereum/rlp"
 )
 
@@ -75,7 +76,7 @@ func TestCalcDifficulty(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	config := &ChainConfig{HomesteadBlock: big.NewInt(1150000)}
+	config := &params.ChainConfig{HomesteadBlock: big.NewInt(1150000)}
 	for name, test := range tests {
 		number := new(big.Int).Sub(test.CurrentBlocknumber, big.NewInt(1))
 		diff := CalcDifficulty(config, test.CurrentTimestamp, test.ParentTimestamp, number, test.ParentDifficulty)
@@ -562,7 +563,7 @@ func TestMipmapChain(t *testing.T) {
 	defer db.Close()
 
 	genesis := WriteGenesisBlockForTesting(db, GenesisAccount{addr, big.NewInt(1000000)})
-	chain, receipts := GenerateChain(nil, genesis, db, 1010, func(i int, gen *BlockGen) {
+	chain, receipts := GenerateChain(params.TestChainConfig, genesis, db, 1010, func(i int, gen *BlockGen) {
 		var receipts types.Receipts
 		switch i {
 		case 1: