Changelog for process-

If this renders badly as markdown, see the plain text version Dec 2013

    * Update to Cabal 1.10 format
    * Remove NHC specific code
    * Add support for `base-`
    * Improve `showCommandForUser` to reduce redundant quoting
    * New functions `callProcess`, `callCommand`, `spawnProcess` and `spawnCommand`
    * Implement WCE handling according to
    * New `delegate_ctlc` field in `CreateProcess` for WCE handling
    * Use `ExitFailure (-signum)` on Unix when a proc is terminated due to
      a signal.
    * Deprecate `module System.Cmd`
    * On non-Windows, the child thread now comunicates any errors back
      to the parent thread via pipes.
    * Fix deadlocks in `readProcess` and `readProcessWithExitCode`