ref EOSIO/eos#175

add test for recursive inline messages, and add soft-concensus limits for recursion and total TX time

ref EOSIO/eos#175

* Implement and test triple i64 record functions

Remove the changes around moving authorizations from Message to
Transaction, as we decided this is not the best way to go. See details
at https://github.com/EOSIO/eos/issues/2#issuecomment-318755302

As of now, almost all the ingredients are in place for authorizing
transactions. We check that the transaction bears signatures sufficient to
satisfy its declared authorizations, and as we execute the transaction,
we ensure that the declared authorizations are sufficient to satisfy the
authorizations required by executing the message handlers, and we ensure
that all of the transaction's declared authorizations were used.

What's not done:
 - Detecting/rejecting duplicate signatures and unnecessary signatures
 - Choosing the correct permission level when a message handler requires
an authorization

Choosing the correct permission level is the big ticket item. To
implement this, we need to implement a missing chunk of system contract
functionality, specifically around defining links from a user's
permissions tree to contracts and message types.