Right-click drag and drop with options "Copy", "Move", "Link"
Icon manager: Use absolute path when setting window icon.
Merge branch 'master' of github.com:MeanEYE/Sunflower
Right-click drag and drop: style fix
File List: fix supported drag actions
Right-click drag and drop: remove unnecessary local variable and methods
Popup menu for tabs
Delete unnecessary _reload method
Tab menu: added "Move to opposite panel"
Tab menu: set moved tab draggable
Tab menu: Added "duplicate tab" menu option
Merge pull request #5 from ArseniyK/right-click_dnd

Right-click drag and drop with options "Copy", "Move", "Link"
Main Window: set tab reorderable and derachible in _page_added
Main Window: Added method for get opposite notebook
Plugin Base: use new get_opposite_notebook method in _move_tab
Merge pull request #6 from ArseniyK/tabs

Popup menu for tabs
Plugin base: Item list: Create emblem menu.
Emblem manager: Add toggle_emblem method.
Plugins: File list: Handle emblem toggling.
Main window: Fix plugin lookup path.