[docs] [issue17700] Update Curses HOWTO for 3.4

[A.M. Kuchling]

A.M. Kuchling added the comment:

Updated version of the patch, applying many changes suggested by merwok:

* use ~curses.funcname notation for links.
* use 3-hyphen em-dash
* minor fixes to various examples
* rewrap long paragraphs (this makes the diff larger -- sorry!)

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Added file: http://bugs.python.org/file30071/update-curses-howto.txt

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