[docs] [issue17700] Update Curses HOWTO for 3.4

[A.M. Kuchling]

A.M. Kuchling added the comment:

I've just verified that I still have commit access to the repo, so unless someone has any further suggested changes to the patch, I'll go ahead and commit it to trunk.  Should I also commit it to the 3.3 branch?

Victor: I'm willing to improve the HOWTO's discussion of Unicode/wide characters if you can point me at some references.

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