Adds functionality to delete bad models. Models are batched together and deleted in one commit.
More testing is needed to ensure data safety. Positive tests on a live database reveal the broken models were truncated and complete ones were kept around successfully. Tests should be done to ensure larger sd0 models are properly saved and not truncated since this command should be able to be run any time.
Valgrind tests need to be run as well to ensure no memory leaks exist.
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