Get A Patch For Two Commits

Produces a raw patch for a single commit (diffed against its firstparent), or a patch-series for a revspec of 2 commits (e.g.`3a8b42..9ff173` where the first commit represents the source and thesecond commit the destination).In case of the latter (diffing a revspec), a patch series is returnedfor the commits on the source branch (`3a8b42` and its ancestors inour example).While similar to diffs, patches:* Have a commit header (username, commit messag...