(gamegrid-add-score): Add info to docstring.
(gamegrid-add-score-with-update-game-score-1): New function, factored out of `gamegriod-add-score-with-update-game-score'. (gamegrid-add-score-with-update-game-score): Use it. Fall back on `gamegrid-add-score-insecure' if the requested file does not exist in $(gamedir), in case the user has installed a game on his own. (gamegrid-add-score-insecure): Accept optional directory argument.
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