core: block cache Has method thread safe

Allow unlocking multiple accounts

Separate accounts with spaces when using --unlock

eth: make the peer-set thread safe

JSON RPC null field updates

Nonce fix for failing transactions

Parallelise nonce checks

Add "removedb" command to Geth

Removes the state and blockchain databases

Multiple CORS domains support

Separated by spaces

fixed race condition in miner

ChainManager now uses a parallel approach to block processing where all
nonces are checked seperatly from the block processing process. This
speeds up the process by about 3 times on my i7