Proposal: overhaul System.Process

[Simon Marlow]

The latest version of the Process overhaul is here:

  http://darcs.haskell.org/~simonmar/process/System-Process.html

and the patch is here:

  http://darcs.haskell.org/~simonmar/process-2.0.patch

Changes from previous:

   - changes to readProcess, and added readProcessWithExitCode,
     as discussed on the list.

   - added close_fds flag to the CreateProcess record, to request
     closing all FDs in the child.
     See: http://hackage.haskell.org/trac/ghc/ticket/1415

   - made it work on Windows, and the patch passes GHC's validate
     on both Windows and Linux.

Reminder: the deadline for discussion is 20 May (5 days).

Cheers,
	Simon