[docs] [issue17700] Update Curses HOWTO for 3.4

[A.M. Kuchling]

A.M. Kuchling added the comment:

Victor: I would like to add a section about using Unicode characters with curses, but found little material about doing that in either Python or the underlying C API.  Do you have any suggested references or example code that I could look at?

(It's probably better to commit the current patch if it's suitable, and commit the wide-character changes in a separate patch once they're ready.)

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