Re-write mortalityTables.(load|list) to prevent timouts when listing installed packages
Rather than using installed.packages() and then loop through all packages and check whether they match ^MoratalityTables$, directly access the library directory structure on disk and list all matching package directories. Problem with installed.packages() is that it does not simply list all existing package directories, but loads all different kinds of other stuff, so try not to use it.
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