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Use undo-tree from git #309
This commit switches to undo-tree from git, which has a nice feature that it doesn't enable in buffers that define their own "undo" behavior (calc-mode being the notable example).
Also, this commit provides autoloads for undo-tree functions, making it conform better to policy. I've emailed upstream requesting that he add autoload cookies to the relevant functions, but he hasn't yet responded.