libcore: Move Cell to core and de-~mut core and std#5108

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pcwalton wants to merge 2 commits intorust-lang:incomingfrom pcwalton:cell-to-core

+91-57

Commits on Feb 25, 2013

librustc: Implement a lint mode for mutable structures; deny by default
pcwalton
committed
libcore: Move Cell to core and de-~mut core and std
pcwalton
committed