EVM opcodes translation

[nevgeny]

Some ideas about EVM ops translation.

• JUMP,JUMPI. EVM uses runtime setting of direction for jump and so we can't define where exactly in code direction will be defined.
  But EVM has a rule about jump. We can jump only to JUMPDEST.
  Solution. We can found all jumpdests and their addresses. After that, for each jumpdest we need to translate in the label.
  And then we need to trace the addresses of jumpdests and their labels. And now before jump or jumpi we can get from map required label.
  To avoid collisions in map we use negative value of the address.(In EVM all values are unsigned)
• Storage. Storage in EVM is map uint256 -> uint256.
  Solution. Now there's no problem about it. We can use sput and sget ops, or not?