Implemented SetAttributeFilter to send where clause to server.

git-svn-id: https://svn.osgeo.org/gdal/trunk@27160 f0d54148-0727-0410-94bb-9a71ac55c965
implemented SetIgnoredFields

git-svn-id: https://svn.osgeo.org/gdal/trunk@27161 f0d54148-0727-0410-94bb-9a71ac55c965
fixed bugs and added CRS to the output.

git-svn-id: https://svn.osgeo.org/gdal/trunk@27162 f0d54148-0727-0410-94bb-9a71ac55c965