FileVisitor extension method

[Paulo Levi]

You're right of  course, the method there would be useless in the context
of nio2, serving more as a adaptation measure to old code that already was
using files and filefilters.
about newDirectoryStream; i'm actually using 'walkFileTree' (in a rather
lame eager way, but that's another story), and although implementations can
certainly filter files themselves, i was trying to separate the iteration
strategy from the actual filtering. FileFilter was the first class i used
and noticed the obvious problem so i ended up reinventing the wheel a bit.

BTW; on a completely different matter, i was hoping that walking the tree
would be a win, (and by rule-of-thumb it seems faster), my actual task
actually requires eagerness at the end, for 2 reasons: one is performance
(ironic) since i am holding a lock of a glazedlist and want to add all as a
collection, the other (unsolvable here), is priority, where some
application logic orders the 'most interresting' first.

I suppose i could fix the first with the terrible antipattern of faking the
collection interface (since they just iterate over it to move the objects).
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