[Openfontlibrary] StixFonts license update

[Simos Xenitellis]

Hi All,
StixFonts have just updated their user license, to the following
http://www.stixfonts.org/user_license.html

The following basic changes took place.

From:
4. You may also
   (a) add glyphs or characters to the Fonts, so long as the base set of
   glyphs is not modified or removed and (b) delete glyphs or characters
   from the Fonts, provided that the resulting font set is distributed
   with the following disclaimer: "This [name] font does not include all
   the Unicode points covered in the STIX Fonts™ set but may include
   others."� In each case, the name used to denote the resulting
   font set shall not include the term "STIX" or any similar term, and
   any distribution of the resulting font set must be free of charge.

To:
4. You may also 
   (a) add glyphs or characters to the Fonts, or modify the shape of
   existing glyphs, so long as the base set of glyphs is not removed and
   (b) delete glyphs or characters from the Fonts, provided that the
   resulting font set is distributed with the following disclaimer:
   "This [name] font does not include all the Unicode points covered
   in the STIX Fonts™ set but may include others." In each case, the
   name used to denote the resulting font set shall not include the term
   "STIX" or any similar term.

Another change was the introduction paragraph of the final license; now
there is a reference to the OFL (L=license).

Simos