[development] Default core theme

[Steven Wittens]

> For us to even think about promoting such horrific code would be an  
> affront to every bit of quality in other parts of Drupal. How evil!

Well you can't have your cake and eat it too... people want tableless  
themes. They are impossible without at least some degree of CSS  
hacks. Otherwise, you must go for tabled, and hardcode it in the  
markup, which is non-semantic.

Steven Wittens