Re: add -interaction=nonstopmode to cygwin/latex test

[Bo Peng]

Hmm... I susually do not use '+' to concatenate strings in pythong. I
use '"latex -interaction=onstopmode %s" % wtmpfname' instead.

Using a single string is of course better. I was thinking in a way
like: ok, we need to *add* this option. :-)

Bo