RFC41: upgrade OGR SQL, ogrinfo, ogr2ogr and test_ogrsf to support multi geometry fields; upgrade CSV driver for read/write support of multi-geometry fields (mainly for the sake of testing)

git-svn-id: https://svn.osgeo.org/gdal/trunk@26381 f0d54148-0727-0410-94bb-9a71ac55c965
Merge branch 'trunk' into trunk_with_coverage