Added support for imagery and DEM's that wrap around the dateline, this required
two passes over the copying of imagery and DEM's to the destination graphs, once for the original position, and once for the wrap around 360 degrees on or before. Also fixed the GeospationExtents constructor that was setting the _max to DBL_MIN rather than -DBL_MAX. This bug causesd the y axis to be computed incorrectly.
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