arnaucube f31ed1d2d1 AddBatch implement using VirtualTree.AddBatch ...

Reduces the num of hashes, dbGet and dbPut on cases D & E.

Current benchmarks:
```
CASE A, AddBatch was 9.101855 times faster than without AddBatch
	nCPU: 4, nLeafs: 1024, hash: Poseidon, db: memory
	dbgStats(hash: 2.047k, dbGet: 1, dbPut: 2.049k)
CASE B, AddBatch was 8.244078 times faster than without AddBatch
	nCPU: 4, nLeafs: 1024, hash: Poseidon, db: memory
	dbgStats(hash: 2.047k, dbGet: 198, dbPut: 2.049k)
CASE C, AddBatch was 8.511131 times faster than without AddBatch
	nCPU: 4, nLeafs: 1024, hash: Poseidon, db: memory
	dbgStats(hash: 2.047k, dbGet: 202, dbPut: 2.049k)
CASE D, AddBatch was 8.565696 times faster than without AddBatch
	nCPU: 4, nLeafs: 4096, hash: Poseidon, db: memory
	dbgStats(hash: 8.191k, dbGet: 1.800k, dbPut: 8.193k)
CASE E, AddBatch was 8.970056 times faster than without AddBatch
	nCPU: 4, nLeafs: 4096, hash: Poseidon, db: memory
	dbgStats(hash: 10.409k, dbGet: 2.668k, dbPut: 10.861k)
TestAddBatchBench: nCPU: 4, nLeafs: 50000, hash: Blake2b, db: leveldb
	Add loop:	10.616145533s
		dbgStats(hash: 824.884k, dbGet: 788.975k, dbPut: 924.884k)
	AddBatch:	942.34815ms
		dbgStats(hash: 122.051k, dbGet: 1, dbPut: 122.053k)
TestDbgStats
	add in loop    dbgStats(hash: 141.911k, dbGet: 134.650k, dbPut: 161.911k)
	addbatch caseA dbgStats(hash: 24.522k, dbGet: 1, dbPut: 24.524k)
	addbatch caseD dbgStats(hash: 26.985k, dbGet: 2.465k, dbPut: 26.989k)
```

2021-05-24 17:05:03 +02:00

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