[NTG-context] updating ConTeXt with ctxtools

[Sanjoy Mahajan]

>    kpsewhich: option `--expand-var' requires an argument

See the Ubuntu installation thread a couple weeks ago (search for
TEXMFLOCAL and Ubuntu).  The problem is that TEXMFLOCAL isn't being
evaluated properly due to quoting differences between Unix and Windows
syntax (with ctxtools using the Windows syntax at the moment).

-Sanjoy

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