Prevent the Gnus registry from being loaded twice at startup
* lisp/gnus/gnus-registry.el (gnus-registry-load): Check if the registry is already loaded, and don't load again unless new optional FORCE argument is non-nil. (gnus-registry-clear): New function to clear the registry, added as a Gnus shutdown. Now that loading doesn't unilaterally reset the registry, we need to make sure it is reloaded when Gnus is.
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