* s3: faster directory hashing
* Introduce Tree.info() API
* tests for s3
* Implement support for azure
* New .ls() API
* remove _iter_hashes from other trees
* assert recursive
* yield strings instead of file_infos
* Add GSTree.ls()
* Add DETAIL_FIELDS to the GSTree
* WebDAVTree.ls()
* proper webdav root directory initalization
* disable arguments-differ