Backport some fixes from HEAD:
Fix some typos in comments and doc-strings
(BaseRenderer.render_map_incrementally): Fix a logic bug in the
optimization that tries not to draw layers under a raster layer. The
bug was harmless. All it effectively did was to produce strange
messages about not being able to draw Layer instances for all vector
layers below a raster layer. Those layers would be invisible anyway
because the raster layer currently always covers the entire window
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branches/thuban-1-0-branch/thuban/Thuban/UI/baserenderer.py