Update draft release notes to 1.6.6 before -rc2
Update draft release notes to 1.6.6 before -rc2

Reword the 1.7.0 warnings, and drop deprecation of "merge <msg> HEAD <commit>..."
syntax.

Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git