doc/README

merge: make calculateupdates() return file->action dict

This simplifies largefiles' overridecalculateupdates(), which no
longer has to do the conversion it started doing in 38e55e55ae4d
(largefiles: rewrite merge code using dictionary with entry per file,
2014-12-09).

To keep this patch small, we'll leave the name 'actionbyfile' in
overrides.py. It will be renamed in the next patch.

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