Update raster TODO as it was sorely out of date

git-svn-id: http://svn.osgeo.org/postgis/trunk@11096 b70326c6-7e19-0410-871a-916f4a2858ee
Additional debug output for rt_raster_gdal_warp()

git-svn-id: http://svn.osgeo.org/postgis/trunk@11097 b70326c6-7e19-0410-871a-916f4a2858ee