Add logging for asserts in contract about casper HOT 6 CLOSED

I haven't worked with strings in vyper before. I think something like the above works for the error message.

Also looks like theres a concat method that will be useful in constructing error messages.

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@djrtwo it will not work, logs are cleared if tx is failed. Stuck with that yesterday, where are damn logs in receipt??? They are cleared if tx is failed. You couldn't have error log.

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Indeed. Makes sense that an Event wouldn't stay in receipt if the transaction failed...

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A very ugly way to log specific failed conditions would be:

@public
def some_method():
    if not condition:
        log.Error(message)
        return

This would only be even close to reasonable at the beginning of a call to a public method before anything else has occurred because it wouldn't revert state. Seems too dangerous to start meddling with the contract like that.

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Closing this tomorrow unless anyone else has a reasonable idea.

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@djrtwo yeah you could make it success just for logs but it's an easy way to make mistakes. You need to reset everything done before by hands etc. Doesn't worth it.

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