QLatin1String now has a constructor that takes explicit length, which
makes it possible to create a QLatin1String that isn't null-terminated.
Made the QTextStream and QDebug << operators work in that case.
Change-Id: I94d051ce2ebfb2d2a403b96d25e040c80a54bf7c
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>