[Distutils] Problems with cli.exe

[Jim Fulton]

Phillip,

I'v updated launcher.c, cli.exe, and gui.exe on the jim-fix- 
setuptools-cli branch.
I've also added a doctest for cli.exe.

The update:

- Causes script arguments to be quoted with correct handling of embedded
   double quotes.   This allows passing arguments with embedded spaces
   and double quotes to scripts.

- Added support for passing a single argument (possibly specifying  
multiple
   options) to the Python executable on the #! line.

- Fixed a bug in handling trailing spaces on the #! line.

Let me know if you'd like me to merge this to the 0.6 branch and trunk.

Jim

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