* Asynchronous transactions (polling based for now).
- Alter eth_sendTransaction to be async, returning one of:
- Transaction hash (signed and submitted).
- Transaction promise ID (< 32 bytes).
- Zero hash (will never be signed).
- Introduce new JSONRPC eth_checkTransaction.
The new API call takes a single argument - a promise ID. It returns
either:
- Transaction hash (signed and submitted).
- null (still pending, call again later),
- Zero hash (will never be signed).
* New RPC eth_postTransaction
- Restore previous semantics of sendTransaction.
- Introduce eth_postTransaction.
- Some refactoring.
* Fix minor lockup.
* Use TransientHashMap to prevent leak.
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