Changes in this Release
- Add support for opening vector datasets
- Add GDALDataset.layerCount() to wrap GDALDatasetGetLayerCount()
- Add GDALDataset.vectorConvert() to wrap GDALVectorTranslate()
- Add wrappers for GDALGetRasterMinimum, GDALGetRasterMaximum, GDALGetRasterDataType, GDALGetRasterStatistics, and GDALGetRasterNoDataValue