Make all unicode Private Use areas SWIDTH1

Make all unicode Private Use areas SWIDTH1

Noticed by naddy@ due to a commit in nano.

There's no current mechanism to allow people who put codepoints in
these private use areas to specify their width, we can however guess
that people who put things there are most likely adding SWIDTH1
glyphs and making that the default will be most likely to do what
they want.  In addition, that's apparently what other systems do
already.

Much feedback and OK schwarze@