new vnstat display to the right of the namei display.
Move the non-vmstat fields {des,num,fre}vn from the vmstat display to a
new vnstat display. Move the dtbuf field there too. The buf and dtbuf
fields are non-vmstat and non-vnstat, so there is no good place to
display them. I need to move at least 1 of them out of the vm stats
for further cleanups of the vm stats, and there is only space for 1
of them in the vn stats. (The best place for the current buf field
is actually /dev/null, since it has been completely broken for about
10 years and broken for longer. It gives an uninteresting virtual
memory count where an interesting real memory count is wanted.)
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