[NTG-context] Problem with German quotes and kerning

[Taco Hoekwater]

Well, if there was correct kerning in the font, then ConTeXt
could at least attempt to do the right thing. As is, all efforts
in this area are wasted because not even the font itself is
right. Until that is fixed, there is no gain to be had from
fixing the current status quo (the font should also have
a kern between \quotesinglebase and itself, btw)

Cheers, Taco