Improve RPC error messages #1176
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This is a trick compatible issue that is easy to confuse. In Ethereum, when attempting to execute a transaction without sufficient funds, the error message you'll likely encounter is: "Insufficient funds for gas * price + value" . This error message only shows when the account balance is not enough to cover the total cost of the transaction. However, In frontier, there are many cases that can lead to this error message, for example, if your gas price is too low. This PR mainly fixes this issue, with some other improvements.