[NTG-context] \showlayout doesn't (2006.10.04 beta)

[Sanjoy Mahajan]

This test file doesn't produce the frames around the margins (2006.10.04
beta):

\starttext
\showlayout
\input tufte
\stoptext

I can't test it on the live context (the missing cont-new.mkii) to make
sure it's not something silly on my part.  But I reverted to the
2006.09.28 beta and it had the same problem, then to the 2006.08.08
release, which was fine.

-Sanjoy

`A society of sheep must in time beget a government of wolves.'
   -- Bertrand de Jouvenal