* Thuban/UI/viewport.py (ViewPort.VisibleExtent): New. Return the
visible extent of the map in projected coordinates
* test/test_viewport.py (SimpleViewPortTest.test_default_size)
(SimpleViewPortTest.test_init_with_size): Add some VisibleExtent()
tests.
(SimpleViewPortTest.test_visible_extent): New. The real test for
VisibleExtent()
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