[development] .tpl-ifying Drupal

[Earl Miles]

Now that the new theming system is basically in (I have one outstanding patch 
and 2 more in the hopper that are not yet at patch level, but they shouldn't 
affect this), we now need a coordinated effort to properly .tpl-ify the 
majority of Drupal's theming functions.

At the same time, I think we should also be looking at what isn't themable 
enough in Drupal and try to correct that at the same time. And this is a good 
place to try and correct Drupal's HTML/XHTML code to conform to the proper 
standards.

The Themer Pack project was started as a gateway to this, and it hasn't been 
entirely successful (though I give HUGE HUGE HUGE kudos to dvessel who did a 
LOT of work on the themerpack, and calebg who started to but got busy).