Rework container object model

Signed-off-by: Olaf Kirch <okir@suse.de>
Fix object deletion code

Signed-off-by: Olaf Kirch <okir@suse.de>
selftest: make sure we clean up the tree after we're done

Signed-off-by: Olaf Kirch <okir@suse.de>
Add TODO file

Signed-off-by: Olaf Kirch <okir@suse.de>
Added README

Signed-off-by: Olaf Kirch <okir@suse.de>