[NTG-context] 2DOWN imposition gives blank pages

[Sanjoy Mahajan]

I've mostly understood arranging but I cannot figure out how to make
2SIDE place a blank page (page 0, to not affect the page numbering) on
the left half of the first arranged sheet and carry on as normal.  To
illustrate, where the enclosed numbers are the unarranged numbers:

p.1: | |1|
p.2: |2|3|
p.3: |4|5|

That way each arranged sheet (p.1,2, or 3) will be a spread from the
final book, plus one saves paper.

Gerben Wierda (12 March 2005) asked this question on the list, but I
did not see an answer so perhaps it is difficult.  I looked at the
code in page-imp.tex and had hopes for \ejectdummypage but my
experments didn't work.

Also my hopes for a cheap hack also were dashed.  I tried inserting a
\null\page[blank] before the \chapter{First chapter}.  But with
doublesided pagenumbering, the chapter starts only on an odd page, so
the single blank page turns into two blank pages.

-Sanjoy

`Never underestimate the evil of which men of power are capable.'
         --Bertrand Russell, _War Crimes in Vietnam_, chapter 1.