[docs] [issue13997] Clearly explain the bare minimum Python 3 users should know about Unicode

[Terry J. Reedy]

Terry J. Reedy added the comment:

I basically agree with Ezio. The doc currently starts with

Introduction to Unicode
History of Character Codes
...

It ends with

Tips for Writing Unicode-aware Programs.
  ...
  The most important tip is:
    Software should only work with Unicode strings internally, decoding the input data as soon as possible and encoding the output only at the end.

I think the how-to should *start* with that general principle and continue with the specific task-based how-tos from the thread. This will tell people who at least vaguely know the following material how to get going in a practical manner.

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versions: +Python 3.4

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<http://bugs.python.org/issue13997>
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