check checkpoint even if no hash in db
update BLOCK_FIRST_TESTNET to 310000
update fixtures
Merge pull request #476 from JahPowerBit/develop

fix checkpoint checking + update test
v9.47.1
Merge pull request #477 from JahPowerBit/develop

v9.47.1
Merge pull request #478 from CounterpartyXCP/develop

Merge v9.47.1 to Master