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Small changeState fix: Removed unwanted BigInt().

• Fixed a problem with nonce in transaction pool: Nonce starts at 0 when checking, it's supposed to be the current nonce of the sender, not 0.
• Add more info to logs.

• The Merkle trie is now flat.
• The path generation algo is now much faster (even though not used yet).
• Fixed a problem with building tree in state.js
• Fixed a problem with storage in runtime.js where storage slots are reloaded every time, state and storage are now cached from the beginning.

• Add in "get_transactionByTxHash" to get tx from tx hash.

• You now have an option to pick the chain you want to sync based on configured genesis hash.
• Node will now log out genesis block's info.

• Fixed syncing:
  • We have a proper queue now.
  • Nodes in-sync can send blocks to others as well.
• Added "use strict"; to files not having it already.
• Changed DB path.

• Rename address to pubkey in get_pubkey.
• The old get_work gets the latest block in the most idiotic way possible.

• Fixed get_blockNumber.
• Changed get_address from returning the client's public key to returning the client's address.
• Added get_pubkey to get client's public key, serializeTransaction and deserializeTransaction to serialize/deserialize transactions.
• Update RPC docs.

Big fix!!!

• Fixed a fatal transaction verification bug that lets contracts make transactions and ignore checks.
• Fixed a fatal state error where storageRoot does not exist.
• Fixed block RPC methods, now blocks are deserialized when sent.
• Optimized bhashDB and stateDB, everything are now bytes!

Add get_nonce RPC method to get account's nonce.