EIP-150 Operation Gas Costs

Documentation for tests/tangerine_whistle/eip150_operation_gas_costs@8db70f93.

Generate fixtures for these test cases for Tangerine_whistle with:

fill -v tests/tangerine_whistle/eip150_operation_gas_costs --fork Tangerine_whistle

Tests for EIP-150 operation gas costs in the Tangerine Whistle fork.