Mostly minor changes but some code tiding up done too so let me know if something broke.
- added couple of higher quantum values
- Cables will start on last active tab
- more keyboard shortcuts and tooltips added
- added menu to check for available updates and to disable version check at start
- added visual feedback for buttons when shortcuts are used
- 'Refresh' buttons refresh devices and nodes too
- small UI tweaks
- some code cleanup
- renamed .desktop file (reversed domain) so you may need to recreate your desktop/panel shortcuts if you use those