[docs] [issue19203] Improve cross-references in curses howto

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


Added file: http://bugs.python.org/file32015/refs.curses-howto.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19203>
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