Wrapper around dump.frames?

[hadley]

Seems like it might be useful to provide some wrapper around dump.frame() so you can do local after-the-fact interactive debugging of a failure that occurred on a node.

[matloff]

If you're referring to a disk failure, I'm not sure it would be that useful, but if you mean a plain old code execution error, this is a great idea. I'll look into adding it to some of the partools ops, and also mention it for the user level in the vignette on debugging that I plan to write.