Support patches down at the bottom of gitmail
New 'includepatches' option puts a seperate set of patches after all commit messages. 'patchstyle' allows you to set 'word' to get word diffs. 'patchsizelimit' (default 1,000) omits patches with more than this many lines. 'maxpatches' (default 20) skips patch generation if there are more than this many commits in the message.
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