[stringtemplate-interest] template existence testing

[Zenaan Harkness]

> Option 3)
> Have a facility (in the driver, or directly in the template engine)
> which can test for the existence of an arbitrary, name not known in
> advance, template, and only _if_ it exists, execute this template, thus
> avoiding the "template not found" ST error:

I'm in the middle of hacking up a method in my driver, making use of the
existing ST facilities (getTemplateNames(), getSuperGroup()), to create
the functionality I am after.

If anyone needs such a beast, let me know and I'll see about tidying it
up.

Zen

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