Unicode Collation Proposed Update

The Unicode Collation Algorithm (UCA) data is being modified to make all
digits with the same numeric value sort the same, whether they are
European (ASCII), Arabic, Devanagari, or others. In addition, the format
of the main data table has changed to omit the (unused) 4th level
weight, and some data tables are moved to the Unicode CLDR project.

These and other changes are in the new proposed update: see PRI 235
<http://www.unicode.org/review/pri235/>. For the exact list of
modifications, see Modifications
<http://www.unicode.org/reports/tr10/proposed.html#Modifications>.

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