Copy statement fails silently if append target does not already exist

[bruth]

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The behavior I expect is for the table to be created if it does not already exist prior to appending.

Seems to be related to #42

[bruth]

One clarification is that it silently failed when no records needed to be inserted. It did of course fail when an insert was attempted and the table did not exist. I still think it should implicitly create the table if it doesn't already exist.