add UTM support for geographic coordinates

[andrejgonev]

I've been trying out this method for a few weeks now and I'm curious to see it develop further.

One slight issue I ran into was the input format for the geographic coordinates. By default, disperseNN2 only accepts coordinates expressed in decimal degrees (latitude and longitude), but some of my datasets have UTM coordinates.

In the code, disperseNN2 converts the decimal degrees into UTM anyways (with utm.from_latlong), so it would be nice to have it accept UTM coordinates as input also. It is not a major issue but would spare the user from having to do the conversion to decimal degrees every time.

Keep up the good work! 😄