[PATCH] Split SrcDist::sdist into several functions

[Bryan O'Sullivan]

This patch merely refactors the sdist function in the SrcDist module so 
that its phases (prepare a tree, build an archive) are available 
individually as functions to outside callers.

This change makes life easier for cabal-rpm.

Please apply.

darcs pull http://darcs.serpentine.com/cabal-for-upstream

Thanks,

	<b
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