making the wide character properties Unicode compatible

[Bruno Haible]

Geoff Keating writes:

> I'd have thought of 00A0 as a control character, if it's not
> whitespace.  It certainly doesn't seem to have a printable
> representation...

U00A0 is a symbol like all other ISO 8859-1 upper half characters. Its
only oddity is that its glyph is empty/transparent/void.

Look for example at the ISO-8859-15 chart (p. 5) in

    http://www.egt.ie/standards/iso8859/8859-15-en.pdf

Printable characters have a white background there, control characters
have a grey one. The one for U00A0 is white.

Bruno