RFC 51: RasterIO() improvements : resampling and progress callback. Add -r and -tr options to gdal_translate

From: Even Rouault <even.rouault@mines-paris.org>

git-svn-id: https://svn.osgeo.org/gdal/trunk/gdal@28053 f0d54148-0727-0410-94bb-9a71ac55c965