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different from SearchFoo, without the wildcarding.

There's one thing I'm not sure about resolve, is whether to return the
original package. e.g.

if I have installed dave-002, and there is dave-003 in one repo, and
dave-002 in another, and I do Resolve(dave, FILTER_NONE) should I get:

installed dave-002
available dave-002
available dave-003

or:

installed dave-002
available dave-003

I think the second makes most sense. Might be good to put an example
in the docs.

Richard.