Testnet 0.7.4

This release fixes a regression introduced in 0.7.3 which caused transactions to be always rebroadcasted to peers, even when the transaction had already been added to the UTX before, which caused network load to increase exponentially and in the end resulted in an OutOfMemoryError.

Other notable changes:

• Pending balance for an address, which pessimistically includes all balance decreases caused by transactions in UTX
• Numerous Matcher improvements
• Increased max transaction length to accommodate Issue Transactions
• Bumped dependencies to newer versions

If you are updating from 0.7.3, it should be safe to keep blockchain data. Otherwise, please remove blockchain.dat and state.dat upon update.