[jdom-interest] TODO: Get recursive content

[Per Norrman]

Hi,

I noticed in the TODO file:

* Add methods to recursively get content and get filtered content.

I digged in my archives and freshened up on a JDOMTreeWalker. It has served
me well in the past, but now I find myself more often using xpath...

Anyway, this class provides an Iterator implementation that does a
pre-order,
depth-first traversal (at least I think i does that) with optional
filtering.
I just updated it to use org.jdom.filter.Filter instead of my own.
You cannot remove nodes, just iterate.

Feel free to use it for any purpose.

/Per Norrman
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