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Closes #1902.
(This fixes an issue explained at the bottom of #4701.)
Adds WMS map server on a per-map basis. It has a few defaults filled in that I know work, but there aren't exactly many public WMS server out there. I tried approximately 30 of the ones listed in #1902 (comment), they were all down. The only ones I found that had world maps were from the USGS: http://viewer.nationalmap.gov/example/services/serviceList.html
I labelled this as being for advanced users only since getting everything right is important and you generally need to read an XML document to understand what the server supports.