Big improvements. Now, the driver inherits from VRT driver itself. Multi-tile multi-band caching added. Smarter use of the information advertized in raster_columns view. Avoid full table scan in situations without PKID/GIST indices. Use of quadtree.


git-svn-id: https://svn.osgeo.org/gdal/trunk@26149 f0d54148-0727-0410-94bb-9a71ac55c965