[IronPython] unicodedata for IronPython update

[Sanghyeon Seo]

Motiviated by this post,
http://lists.ironpython.com/pipermail/users-ironpython.com/2006-July/002882.html

I added unidata_version and normalize to my unicodedata module.
http://sparcs.kaist.ac.kr/~tinuviel/fepy/lib/unicodedata.py

Unfortunately, encodings.idna needs bidirectional() function, which I
couldn't find a simple .NET equivalent.

Seo Sanghyeon