[Pythoncard-users] installation instructions update

[Kevin A. <al...@se...>]

I created a new installation page which links to the specific installation
instructions for each supported platform.

http://pythoncard.sourceforge.net/installation.html

Nobody has complained about the Windows instructions, so I'm assuming those
are stable and work fine for everyone. If you are using Linux or Mac OS X,
you should point out any problems you run into so the docs can be updated.

Thanks,

ka