Current default layout is very limited and too much is coded into it.
Very simple HTML5 layout:
<!DOCTYPE HTML>
<html>
<head>{{*head|core}}</head>
<body>
<header>{{*header}}</header>
<article>{{_main}}</article>
<aside>{{*sidebar}}</aside>
<footer>{{*footer}}</footer>
</body>
</html>
I've added a more HTML5 version of the above. I'm not *entirely* sure if it's perfect...
Thanks for doing that! I simplified it a bit further.