* cpu_usage limit for an action is properly tracked even through inline actions
* receipt should store net usage in words
* total billed cpu usage for a transaction should be rounded up to nearest multiple of 1024
* enforce the cpu and net usage limits set in chain configuration
* additional stateless validation on generated transactions
* clear expired input transactions (and do not touch generated transactions) on start block rather than finalize block
* fix clear expired input transactions to use pending block time rather than head block time
* update producer authority at start of block (implemention still necessary)
* move resource limit updates and updating tapos from commit_block to finalize_block
* fix to controller::last_irreversible_block_id()
* reduce default_base_per_transaction_net_usage