[development] patch to opt-in JS textarea resizers, instead of opt-out

[Bèr Kessels]

Hello,

I was experiencing quite some issues with the JS texterea resizers. Besides 
that I dislike such cruft (sorry features), in core, these issues were just 
annoying. 

I still remain with my point that such things are really candidates for 
contrib modules. But I think I found a nice intermediate solution: opt-in.

   http://drupal.org/node/44130. 


I patched the form-resizers to be off by default. I decided to mock up a patch 
that makes the form resizers opt-in:
 meaning developers can switch it -on- instead of having to swithc it -off-.

On top of that, I patched chameleon to show the resizers! So we can also show 
the power of form theme functions in core!

Bèr
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