update max block size, fix performance of chain_controller::head_block_producer, and increase batch sizes for benchmark

Log: Block number, timestamp, producer, duration to apply, transaction count, pending transaction count

- added checks on redundant scope specification in readscope #70

remove try/catch spam with immediate strings concatenated only when exceptions are thrown. ref EOSIO/eos#228

Fix a slippery little bug in the new eosc, which was causing messages'
data payloads to be a serialized Bytes object rather than merely the
bytes contained by the object. The difference was just one length byte
at the beginning of the message data payload, but of course that was
enough to break parsing.

Previously, all nodes rejected transactions with irrelevant signatures
always. Now, this is still true, except if a transaction with irrelevant
signatures is included in an otherwise valid block: then the transaction
is accepted even though it fails the soft check.

* Implement and test triple i64 record functions

Test that the default authority for a contract is accepted when there is
no more specific authority set

Only check for irrelevant signatures if signature checking is enabled.

Previously, only the used_authorizations from the original message were
being tracked, even though the original message might notify other
accounts which in turn might require more authorizations. This is now
fixed so that all required auths from all handlers called in the
processing of a message and its notifications are tracked.

This fixes "irrelevant authority" errors which were being thrown
incorrectly.

Affected contract methods:
 - newaccount
 - updateauth
 - deleteauth
 - linkauth
 - unlinkauth

Also, blockchain initialization (the genesis block) behaves like it is
applying a block, even though the genesis block isn't really a block.

We now enforce a recursion depth limit for authority checks. If the
limit is hit, it silently rejects the authority.