[Seaside] BlockClosure in Squeak

[Sebastian Sastre]

Hi there,

	other day I've found a strage updater result: seeing the component
become a prinString of a BlockClosure. Debbuger revealed necessary 3 methods
in BlockClosure:

	#renderOn: 
	#handleRequest: 
	#fixCallbackTemps

	the first two are copies of the same ones found at BlockContext but
fixCallbackTemps is just for compatibility, it should do nothing.
	
	This affect only who uses NewCompiler and it's true contexts in
Squeak,

	cheers,

Sebastian Sastre