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* Updated to Deovi==0.7.0, this is a breaking changes since previous Deovi dumps won't
be compatible anymore (you need to dump with Deovi>=0.7.0);
* Fixed requirements for optional ``bigtree`` dependency to ``pandas``;
* Added field ``last_update`` to ``Device`` model;
* Improved model admins with list display, list filters and field search;
* Added validation on device slug from loader and fill title with slug on device
creation;
* Improved device index and detail to include disk usages;
* Refined device index layout;
* Added new device tree export action to sum sizes of selections;