Fix#456 and #537.
* Make it possible for an IESG member to add a comment (for the document history) in the change
- Legacy-Id: 2637
Note: SVN reference [2625] has been migrated to Git commit 9e2820df4215bab1258759432d90921f27c66579
Adding the last call e-mail to the history of the draft.
- Legacy-Id: 2636
Note: SVN reference [2622] has been migrated to Git commit 1b42e7986c2cf6d838b0de86ef0aa8b8cb053339
- Legacy-Id: 2503
Note: SVN reference [2498] has been migrated to Git commit ea999ce88a3067f90f590859f7b0ebe0966eb446
Note: SVN reference [2500] has been migrated to Git commit bbd9d3f4079439839105946c2f3b4556ca9d3a92