Update external geometry and parameters repository to latest version, refs #1851

• bring in TRD 20a with extended stations stepping

added 6 commits

• ce577c97...4408f9a9 - 5 commits from branch computing:master
• a0bf036c - Update external geometry and parameters repository to latest version

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changed title from Update external geometry and parameters repository to latest version to Update external geometry and parameters repository to latest version, refs #1851

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