GML huge file resolver: initialize members of huge_tag structure, use sqlite3_prepare_v2 instead of sqlite3_prepare, and add more precise error message in gmlHugeFileSQLiteInsert()

git-svn-id: https://svn.osgeo.org/gdal/trunk/gdal@26557 f0d54148-0727-0410-94bb-9a71ac55c965