Small enhancements for sample Software page

+ Add relationships for the sample software. Refinements to the page
layout.
+ Break out horizontal menus into plain horizontal menus and the big
"page" level ones (bartender, wiki nav). Can re-use that styling for
tabbed-like navigation
+ Keep menu styling with the menus CSS
+ Let link lists handle their own top margin if they end up in body copy
+ Refinements to table styling and color choices
+ For Compactor, also add .copy class so elements (mostly tables) don't
lose their styling
+ For Compactor, make sure tables/pre blocks don't get wrapped in the
overflow divs multiple times