1.16.0

New features:

• Fix GitHub Issue #83: Add option to copy-drag nodes

  • By checking "Copy on drag" checkbox on the toolbar
    one can copy a node just by dragging a new connected node

• Add Ctrl+0 as shortcut for zoom to fit

Bug fixes:

• Fix GitHub Issue #70: Edge tries to reposition while moving a group

Other:

• Make the Full Screen menu action checkable to avoid confusion

• General code refactoring

• Upgraded to C++14