Pass relevant subset of Ethereum VM test suite

[mbrock]

No description provided.

[mbrock]

Going to clarify this and work on it next week.

At least now we have a good test suite runner for VMTests.

[mbrock]

As of 0.10 there are only five unexplained VMTests mismatches, and the rest of the 25 mismatches are explained:

• 12 are timeouts from the vmPerformance suite, they probably work in fact;
• 7 are because we don't implement CALLCODE; and
• 1 is because of precompiled contracts.

The unexplained mismatches are:

• vmSystemOperations/ABAcalls1
• vmSystemOperations/ABAcalls2
• vmSystemOperations/ABAcalls3
• vmTests/arith
• vmTests/mktx

These all unexpectedly succeed instead of erroring. It seems like they should fail on CALL instructions, but I don't know why -- and CALL isn't really executed in the VMTests anyway, so it's kind of strange.