Abort earlier upon multi-panics

The double-panic `abort` is run after the logging code, to provide
feedback in case of a double-panic. This means that if the panic
logging fails with a panic, the `abort` might never be reached.

This should not normally occur, but if the `on_panic` function detects
more than 2 panics, aborting *before* logging makes panic handling
somewhat more robust, as it avoids an infinite recursion, which would
eventually crash the process, but also make the problem harder to
debug.

This handles the FIXME about what to do if the thread printing panics.

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