Patch By Max Kanat-Alexander <mkanat@bugzilla.org> (module owner) r=colin for docs, a=myk

Patch by Martin Wulffeld <martin@wulffeld.org>.
r,a=jake
Also, added Martin to the section about people who have made signifigant conrtibutions.

The source files for the Bugzilla Guide have long been using the XML version of DocBook but still residing in the sgml/ directory with an extension of .sgml.

In an effort to maintain CVS history, the raw files were copied on the CVS server to the xml/ directory and renamed to have .xml for the extension; any checkins before this one did have the .sgml extension.

be used for 2.14 documentation due to inconsistencies.

The README is now gutted, pointers to Guide.  Also some new sections added,
old ones fixed, and notes appended to deprecated sections I've not yet had
the heart to remove.