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Add 'packages/d/dealii/' from commit 'd6b6940e51af8278c9f2798f8f448c6f37181314' git-subtree-dir: packages/d/dealii git-subtree-mainline: e61a1170627b8dc3092fcd76a71bf685d6d483f4 git-subtree-split: d6b6940e51af8278c9f2798f8f448c6f37181314