* Implement EIP234
* Make filter conversion returns error if both blockHash and from/toBlock is found
This also changes PollFilter to store the EthFilter type, instead of the jsonrpc one, saving repeated conversion.
* Return error if block filtering target is not found in eth_getLogs
Use the old behavior (unwrap_or_default) for anywhere else.
* fix test: secret_store
* Fix weird indentation
* Make client log filter return error in case a block cannot be found
* Return blockId error in rpc
* test_client: allow return error on logs
* Add a mocked test for eth_getLogs error
* fix: should return error if from_block/to_block greater than best block number
* Add notes on pending
* Add comment for UNSUPPORTED_REQUEST
* Address grumbles
* Return err if from > to
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