[Python-3000] String to unicode fixes in time and datetime

[Ero Carrera]

Hi,

I'm attaching a small patch result of attempting to tackle part of  
one of the tasks in the Google Sprint.
The patch removes most of the references of PyString_* calls in the  
"time" and "datetime" modules and adds Unicode support instead.

There's a problem in "datetime" with  
"_PyUnicode_AsDefaultEncodedString". As there's no current equivalent  
that would provide an object of type "bytes", there are two  
occurrences of PyString_* functions to handle the returned "default  
encoded string" and convert it into bytes.

cheers,
--
Ero


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