[issue3811] Update Unicode database to 5.1.0

[Martin v. Löwis]

Martin v. Löwis <martin at v.loewis.de> added the comment:

> That's unfortunate -- perhaps the 2.6 flag and data can be brought in
> line, to make future merges easier?

I thought of that, however, merging the databases themselves would still
not be possible: the 3.0 database has the flags set in many records,
which causes merge conflicts (as the 2.x database has different flag
values). So regenerating the database is necessary, anyway.

In future changes, it might be useful to have new flags with the same
values, so that such patches can be merged without conflicts in the
generator.

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