Support git style diffs for HGTool if they are part of an HG Changeset.
Review Request #1174 - Created Oct. 20, 2009 and discarded
Issue #472 says that "HGTool does not support git style diff" because "git-style diffs from Hg don't include revision information." However if that git-style if came from an 'hg export' command then it does have the information in the header. This code parses it. Hold on a second. This doesn't handle all the cases. I'll have to work on this a little more.
Uploaded a diff generated by hg export, hg export --git, hg diff. All succeeded. Tried to upload a diff generate by hg diff --git. Still failed.