Simplified the TopoImage class by using a Sheet as the container for an image. That way, coordinate transforms can work using the  standard sheet.py functions. Also, altered how the initial image scaling works (it remains to make the initial  scaling relative to the default 1.0 retinal area, rather than the current retina).
Simplified the TopoImage class by using a Sheet as the container for an image. That way, coordinate transforms can work using the  standard sheet.py functions. Also, altered how the initial image scaling works (it remains to make the initial
 scaling relative to the default 1.0 retinal area, rather than the current retina).


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