Summary of error handling

[Rod Widdowson]

> I expose the HTMLEncoder class as a request or view scoped variable in the
> flow definition (or in the Spring error handling extension that generates
> the view model), so it's trivial, just $encoder.encodeforHTML()

Does that work? As I remember I was tripping over some nasty errors because
it looks like Velocity was looking for a method called encodeforHTML on an
object of type 
Class<HTMLEncoder>

But that was some time ago and I didn't spend too much time trying to bottom
that out.  Certainly, none of our current vm files make use of $encoder.

I can dig further if required.

R