Add fallback and shortcut to good-old dd instructions
- Add shortcut from Debian and expert to Linux to prevent installing
extra stuff [36]
- Point people with Wheezy to dd
- Explain briefly dd as alternative to GNOME Disks [61]
- Add bug note about previous versions of GNOME Disks [61]
Feature Branch: web/10642-fallback-to-dd
Parent Task: #8592 (closed)
Original created by @sajolida on 10642 (Redmine)