[issue3018] tkinter demos fixed

[Guilherme Polo]

Guilherme Polo <ggpolo at gmail.com> added the comment:

I forgot to say that some demos weren't fixed by the previous patch,
demo/reasons below:

guido/ss1            rexec is gone
guido/MimeViewer     can't test it right now
guido/mbox           can't test it right now
guido/ManPage        partly fixed, may contain UnicodeDecodeError issues

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