Disable common-options button for datasets
Treeview in License page

* Changed Gtk::ListStore in Gtk::Treeview
* Displayed different types in license treeview
* Displayed packages sorted by types
* Fixed license-treeview width
Resizable scroll windows in License page

* Added HPaned container in license page
Fix trees display in License page

* Displayed type trees which contain packages
Add of dataset format in Download page
Fix of left-side hpained minimum size