* Switch sharing kwarg default to False
Resolves#1705
* Replace GDALOpenShared with GDALOpen except in one shim
* Revert two open_dataset to GDALOpen
* Run tests under gdb
* Increment ref count in WarpedVRTBase
* Open a new dataset handle in WarpedVRT
* Remove gdb
* Remove exceptions from open_dataset in _shim1
Makes usage much easier
* Fix in-memory dataset leaks in _reproject