based on the information at The Unix Historical Society web page
(http://www.tuhs.org/Unix_History). Where multiple sources differ,
retain all data. Prefer 2.79BSD to 2.7.9BSD, since the former is from
/LABEL form the actual release. Use the /LABEL date as in the TUHS
tables (the curious can read http://minnie.tuhs.org/Unix_History/2bsd
for all the conflicting date confusion if they want).
Approved by: re@
c173381881