Bump version to 3.8.4 Update NEWS.
Tag release 3.9.1
Tag release 3.9.2
Tag release 3.9.3
Tag release 3.9.4
Tag release 3.9.5
Tag release 3.9.90
Tag release 3.9.91
Tag release 3.9.92
Tag release 40.0
Tag release 40.1
Tag release 40.10
Tag release 40.2
Tag release 40.3
Tag release 40.4
Tag release 40.5
Tag release 40.6
Tag release 40.7
Tag release 40.8
*Really* tag 40.8