* Escape the outPath in the generated nixexpr.tar.bz2 in channels, because

store paths with `=' in them (such as /nix/store/chj5wrbmi43zjx77svlr4lgnrqi9pwfy-guile-CPPFLAGS=-DSCM_DEBUG=1-1.9.8.113) broke it.

Created by  Eelco Dolstra  on March 17, 2010
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