Made downloaded files have extensions.
Enable syntax highlight.
Add styles of syntax highlight.
Add link to html version.
Made H3 similar to  other headings.
Remove duplicated  breadcrumb on home page.
Log output to messages framework.
Unify disable and save.
Split custom save tasks into methods.
Make the object model explicit.
Stop an exception that would aoccur if format not exist.
Make the auto html easier to expand.
Add comment.
Updated help documents.