[MERGE] Change FileNames allocation strategy

[Robert Collins]

On Mon, 2007-08-06 at 15:53 +1000, Robert Collins wrote:
> This changes name allocation from the FileNames class to the caller.

However it was incomplete for the purpose I needed, so here is an update
that detects collisions.

-Rob
-- 
GPG key available at: <http://www.robertcollins.net/keys.txt>.
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