[Therion] seperate layers for surface and sketch images

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[Therion] Fixed corner co-ordinates on a map

Hi all I am looking to try and generate an output which will always have the same co-ordinates. I am try to do this as we have a rapidly expanding cave system which we would like to plot on google earth (or the likes) using Bill Chadwicks map of the Mendips http://www.bdcc.co.uk/mendip.html