UAX #29, Unicode Text Segmentation, update to improve Mongolian word segmentation

/Unicode Standard Annex #29, Unicode Text Segmentation/, will be updated
for Unicode 9.0. A draft of the proposed update
<http://www.unicode.org/review/pri306/> is available for general public
review and comment.

The Word_Break classification of U+202F NARROW NO-BREAK SPACE (NNBSP) is
revised to correct the text segmentation behavior of U+202F for
Mongolian usage. For further background on this issue and possible ways
to address it, see PRI #308 <http://www.unicode.org/review/pri308/>,
/Property Change for U+202F NARROW NO-BREAK SPACE (NNBSP)/.

In this revision, the formerly empty Prepend class of the
Grapheme_Cluster_Break property is redefined to consist of all prefixed
format control characters and a few other characters with certain
Indic_Syllabic_Category property values.

The corresponding property value changes will be incorporated in the UCD
data files for Unicode 9.0.

http://blog.unicode.org/2015/09/uax-29-unicode-text-segmentation-update.html

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