Features:
-* teach fd_get_crtime_at() the btrfs crtime
+* change default container location from /var/lib/container to /var/lib/machines
* import pull-gpt: create writable snapshot of downloaded image, by the right name
* "machinectl diff"
+* "machinectl read-only"
+
* show btrfs quota in machinectl
* "machinectl commit" that takes a writable snapshot of a tree, invokes a shell in it, and marks it read-only after use