Add Part 6 comment slide
Rename comment slide
Change master class from part1 to part6

Correlates with chapter in source presentation
Fix width of .middle CSS class
Sepearte engine from theming in defaults
Move graphic class to be within slide

Save the class on the <section> element to be for the slide master, if
any.
Add vector graphics slides
Update end slide with links
Minor tweaks
Fix shout class

Modify shout style to work on block elements rather than section.
Adjust cover and cover.wide styles to affect img
Add <ul> slide
Tweak list CSS
Add links to TheEnd
Textual updates