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Process reorganisation: the System.Process library moves into base,
and System.Cmd is re-implemented in terms of it.
Thanks to Krasimir Angelov, we have a version of System.Process that
doesn't rely on the unix or Win32 libraries. Normally using
unix/Win32 would be the right thing, but since we want to implement
System.Cmd on top of this, and GHC uses System.Cmd, we can't introduce
a bunch of .hsc dependencies into GHC's bootstrap libraries.
So, the new version is larger, but has fewer dependencies. I imagine
it shouldn't be too hard to port to other compilers.
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simonmar