Delete a single custom property set

[Richard Gaskin]

Ray asked:

> Thanks for this tip.  That's really weird though isn't it?

It may be helpful to submit a request for that in the Bug DB, something 
like:

delete propertySet <propSetName>

Under the hood it would do what we can do now in script, but it would be 
much more intuitive.

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  Richard Gaskin
  Fourth World
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