history/Credits: aeb's Hack

Give an implied explanation for the seemingly odd copyright info in
the source files and the run-time startup banner.

The extra Hack version number, the release dates, and the newsgroup
creation are from
 https://homepages.cwi.nl/~aeb/games/hack/hack.html
which is the "Brouwer's /Hack/ page at CWI" external link near the
end of Andries Brouwer's Wikipedia page.

dat/history

@@ -5,9 +5,14 @@ Behold, mortal, the origins of NetHack...
 Jay Fenlason wrote the original Hack, with help from Kenny Woodland,
 Mike Thome, and Jon Payne.
 
-Andries Brouwer did a major re-write, transforming Hack into a very different
-game, and published (at least) three versions (1.0.1, 1.0.2, and 1.0.3) for
-UNIX(tm) machines to the Usenet.
+Andries Brouwer did a major re-write while at Stichting Mathematisch Centrum
+(now Centrum Wiskunde & Informatica), transforming Hack into a very different
+game.  He published the Hack source code for use on UNIX(tm) systems by
+posting that to Usenet newsgroup net.sources (later renamed comp.sources)
+releasing version 1.0 in December of 1984, then versions 1.0.1, 1.0.2, and
+finally 1.0.3 in July of 1985.  Usenet newsgroup net.games.hack (later
+renamed rec.games.hack, eventually replaced by rec.games.roguelike.nethack)
+was created for discussing it.
 
 Don G. Kneller ported Hack 1.0.3 to Microsoft(tm) C and MS-DOS(tm), producing
 PC HACK 1.01e, added support for DEC Rainbow graphics in version 1.03g, and
@@ -20,7 +25,9 @@ producing ST Hack 1.03.
 Mike Stephenson merged these various versions back together, incorporating
 many of the added features, and produced NetHack version 1.4 in 1987.  He
 then coordinated a cast of thousands in enhancing and debugging NetHack 1.4
-and released NetHack versions 2.2 and 2.3.
+and released NetHack versions 2.2 and 2.3.  Like Hack, they were released by
+posting their source code to Usenet where they remained available in various
+archives accessible via ftp and uucp after expiring from the newsgroup.
 
 Later, Mike coordinated a major re-write of the game, heading a team which
 included Ken Arromdee, Jean-Christophe Collet, Steve Creps, Eric Hendrickson,