trivial diff: undo copyright changes

[Fergus Henderson]

Estimated hours taken: 0.5

library/*.m:
compiler/*.m:
	Undo Zoltan's bogus update of all the copyright dates.
	The date in the copyright header should reflect the years
	in which the file was modified (and no, changes to the
	copyright header itself don't count as modifications).

[diff omitted, because it is very boring]

-- 
Fergus Henderson <fjh at cs.mu.oz.au>   |  "I have always known that the pursuit
WWW: <http://www.cs.mu.oz.au/~fjh>   |  of excellence is a lethal habit"
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