Rework source layout in preparation for modular sudo.

doc/history.pod

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+=head1 A brief history of sudo:
+
+Sudo was first conceived and implemented by Bob Coggeshall and Cliff
+Spencer around 1980 at the Department of Computer Science at
+SUNY/Buffalo.  It ran on a VAX-11/750 running 4.1BSD.  An updated
+version, credited to Phil Betchel, Cliff Spencer, Gretchen Phillips,
+John LoVerso and Don Gworek, was posted to the net.sources Usenet
+newsgroup in December of 1985.
+
+In the Summer of 1986, Garth Snyder released an enhanced version
+of sudo.  For the next 5 years, sudo was fed and watered by a handful
+of folks at CU-Boulder, including Bob Coggeshall, Bob Manchek, and
+Trent Hein.
+
+In 1991, Dave Hieb and Jeff Nieusma wrote a new version of sudo
+with an enhanced sudoers format under contract to a consulting firm
+called "The Root Group".  This version was later released under the
+GNU public license.
+
+In 1994, after maintaining sudo informally within CU-Boulder for
+some time, Todd Miller made a public release of "CU sudo" (version
+1.3) with bug fixes and support for more operating systems.  The
+"CU" was added to differentiate it from the "official" version from
+"The Root Group".
+
+In 1995, a new parser for the sudoers file was contributed by Chris
+Jepeway.  The new parser was a proper grammar (unlike the old one)
+and could work with both sudo and visudo (previously they had
+slightly different parsers).
+
+In 1996, Todd, who had been maintaining sudo for several years in
+his spare time, moved distribution of sudo from a CU-Boulder ftp
+site to his domain, courtesan.com.
+
+In 1999, the "CU" prefix was dropped from the name since there has
+been no formal release of sudo from "The Root Group" since 1991
+(the original authors now work elsewhere).  As of version 1.6, Sudo
+no longer contains any of the original "Root Group" code and is
+available under an ISC-style license.
+
+In 2001, the sudo web site, ftp site and mailing lists were moved
+from courtesan.com to the sudo.ws domain (sudo.org was already
+taken).
+
+In 2005, Todd rewrote the sudoers parser to better support the
+features that had been added in the past ten years.  This new parser
+removes some limitations of the previous one, removes ordering
+constraints and adds support for including multiple sudoers files.
+
+sudo, in its current form, is maintained by:
+
+	Todd Miller <Todd.Miller@courtesan.com>
+
+Todd continues to enhance sudo and fix bugs.