Combine parts of Chapter 21 and Appendix D from the FreeBSD Handbook
into a separate 'Contributors' article so that everything is in one
place. This was done for various reasons :

• This information is way out of scope for the Handbook.
• When we talk about "Contributors" to FreeBSD or developed by "A large team of individuals" on the web site we can point the user to a complete document on our web page rather than two separate chapters in the Handbook.
• We can create a plain-text 'CREDITS' file from this SGML and put it in /usr/share/misc or similar for all FreeBSD installs if that is desired.

Reviewed by: Nik