[Python-3000] Support for PEP 3131

["Martin v. Löwis"]

> FWIW the Ruby interpreter (1.8.5) seems to require
> this flag to allow you to turn on the Japanese code
> set.
> 
>   -Kkcode  specifies KANJI (Japanese) code-set
> 
> I have no idea whether or not this cripples the
> feature in Ruby, and perhaps it's an apples/oranges
> comparison.

If you don't have source encoding declarations (like the one
in PEP 263), you must have some means of setting the source
encoding; this is what -Kkcode does (similar to javac's
-encoding command line option).

This approach has several flaws, e.g. you can only specify
a single encoding, which breaks if you have modules in
different encodings.

In any case, it's different from the suggested -UU option:
Python already knows what the source encoding is, -UU
would not change that. Instead, that option would merely
serve to constrain the source code (if it's not being
passed).

Regards,
Martin