#89 Categories: UCA sortkey wikis should not be sorted by binary values

[gnosygnu]

First described here: Categories: UCA sortkey wikis should not be sorted by binary values

As an example, see http://vi.wikipedia.org/w/index.php?title=Th%E1%BB%83_lo%E1%BA%A1i:S%C6%A1_khai_l%E1%BB%8Bch_s%E1%BB%AD&pageuntil=Li%C3%AAu+C%E1%BA%A3nh+T%C3%B4ng#mw-pages.

In MediaWiki, the "Đ" character sorts after the D. In XOWA, it sorts by binary collation so it goes after Z.

This will be addressed in a future release, after I make headway on making /category2/ available through the UI