[m-rev.] for test and review by Peter: fix mantis 391

[Zoltan Somogyi]

On Sat, 15 Aug 2015 18:59:05 +1000 (AEST), "Zoltan Somogyi" <zoltan.somogyi at runbox.com> wrote:
> > FlagName requires escaping (with add_quoted_string?).
> > It would be safe to escape EnvVarName as well, but not strictly
> > necessary due to the (undocumented) restrictions on its characters.
> 
> I will fix that.

I am committing the attached fix.

Zoltan.
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