[Imports] Arkansas address point import

[Nathan Mills]

I propose to import the situs address points available from Geostor
(http://www.geostor.arkansas.gov/G6/Home.html?q=situs+address). I have
confirmed with that this data is public domain, and spot checks of its
accuracy in areas I'm personally familiar with show that the vast
majority of the points are of high accuracy.

There are some in rural areas that could use realignment, but those that
I've seen all fall on the correct property, even if the point is not
directly on the structure, so they're still useful for most purposes.

I've created a translation for ogr2osm and processed a couple of
counties into osm files as a test:

Washington County: http://www.nwacg.net/washar_addresses.zip (2.6MB
zipped, 36MB expanded)
Sebastian County: http://www.nwacg.net/sebar_addresses.zip (2MB zipped,
25MB expanded)

I'm open to suggestions as to how to better tag the points if anyone has
any ideas.