Support panic backtraces, add log buffer #48
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When a test fails there is no way to use RUST_BACKTRACE=1 to show a
backtrace. This patch fixes the issue.
Additionally, it adds an explicit log buffer that can be used to work
around #9. That's a feature that the std harness doesn't have, but I
think it's appropriate to add since it's a workaround for something
libtest-mimic doesn't but should have (stdout/err capturing)