feat: add support for rotating jwt keys This allows jwt_secret to have multiple ',' separated secrets. The first/leftmost should be used to sign new JWTs. All of them are used (starting from left/newest) to try to verify a JWT. If the first secret is < 32 chars in length JWTs are disabled. If any of the other secrets are < 32 chars, the configuration code causes the software to exit. This prevents insecure (too short) secrets from being used. Updated doc examples and tests.

Other Docs
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.. toctree::
   :maxdepth: 2

   docs/upgrading-history

   docs/tracker_templates

   Design Overview <docs/overview>
   Design (original) <docs/design>

   Software Carpentry and Short Papers <docs/sc>

   docs/developers

   Notes about the MySQL Database backend <docs/mysql>
   Notes about the PostgreSQL Database backend <docs/postgresql>

   Richard Jones implementation notes <docs/implementation>
   docs/security-history