Jun Wu <quark@fb.com> [Thu, 30 Mar 2017 18:23:27 -0700] rev 31753
revlog: use raw revisions in revdiff
See the added comment. revdiff is meant to output the raw delta that will be
written to revlog. It should use raw.
test-revlog-raw.py now shows "addgroupcopy test passed", but there is more
to fix.