Message3685

We currently lack idna, historically due to the fact that we lacked 
unicodedata and stringprep module also

We now have most of a unicodedata implementation but this doesn't help 
idna/stringprep due to it specifically relying on unicode 3.2

idna isn't used for many things but critical for correctly converting 
unicode/nonascii hostnames to ascii. I see 2 uses of it in the stdlib, 
in httplib and the socket module

We can likely leverage Java 6's java.net.IDN for this