Add new demo for transforms, make code work locally.

New Unit 7 demo for the viewing pipeline. Also, set the path to "" for
much of the code so that these programs work locally on machines. Note
inclusion of sprintf for new demo.

Gundega: note that sprintf.js needs to be added, along with unit7-view-pipeline.js. sprintf.js must be included along with all the other Javascript libraries needed (i.e. by the HTML file). Don't bother updating all the other modified js files, as these changes are meant for local use.