[Xastir] Cropping images

[James Ewen]

> Generally, what I do with the US mosaic is provide the appropriate 
> coordinates in a .geo file.  Xastir uses that appropriately.  We don't 
> crop them.

I have provided the appropriate coordinates in a .geo file, however I would 
like to crop my image.

I have now found the information in README.MAPS. I have the local weather 
radar map available as a layer... cool stuff!

James
VE6SRV