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Status of Global_planner - I'm not sure if the latest version is in the debs yet, but the global_planner is stable and supported.
Replacement - I intended it as a replacement, but did not delete navfn for backwards compatibility. It should be a drop-in replacement.
The exclusion of the pluginlib xml is an oversight and shall be updated soon. I will also try to make a wiki page.
Important Note - Although you think it would, A* does NOT provide the same path as using Dijikstra's, which I discovered only recently. The potential field calculations that Navfn performs require a wide swath of values in the grid, and thus A* does not provide enough values to get a similarly smooth path. I'll try to include an illustration of this on the wiki.
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