Unicode data removal from descr-text.el

[Dave Love]

The code that I added to descr-txt.el to report Unicode properties has
been commented out, saying:

  ;;; We cannot use the UnicodeData.txt file as such; it is not free.

I don't understand this.  I need to use that file to work on Unicode
support, which was why I added the code, and code to interface with
non-free programs hasn't been removed.  However, I don't understand
why that file is considered non-free anyhow.  It is freely
distributable according to the notice at
<URL:http://www.unicode.org/Public/UNIDATA/UCD.html#UCD_Terms> and
modifying it isn't relevant (useful), since it documents a standard.
It's like RFCs, for instance.