Prevent cycles in graph of certificate issuers
Check the graph of certificate issuers for cycles when adding keys to the hierarchical key list model. If a key would cause a cycle, then mask its issuer causing it to be treated as top-level key. It is undefined which key in a circular certificate chain will become the top-level key of this chain. Kudos to the Boost Graph Library! GnuPG-bug-id: 5697
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