[DRAFT] Warn user on zero address use #676
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Description
This attempts to fix #671 Still needs work, because that test in particular doesn't fire. We need to add a verbosity flag, otherwise libraries that use us will have all sorts of junk printed on the console. Default is zero (is it's seamless for libraries), but we set it to 1 in all our use-cases (cli/testing) for the moment.
Checklist