Added primary active link. WIP on secondary (sidebar) active link.

Active sidebar links on scroll or on click sidebar links.
hotfix for scrolling issue.
scrolling hotfix 2
rebuilt.
Allows you to use '=' to get a fragment with no code example rendered.

prune comment

Conflicts:
	download/index.html
	download/tdcss.js
	src/tdcss.js
better padding between sidebar and content.