Delete obsolete code, regarding multiple confirmation in single view
Show/hide welcome screen depending on available machines, Refs. #651
Use existing functions to get flavor and image info, Refs. #651
On action cancel do not remove selected machines in navigation box, Refs. #651
Fix positioning and spacing of elements, Refs. #651
Properly apply and remove selected class to actions, Refs. #651
Add some spacing to make code more readable
Do not allow multiple actions in single view
fix error mechanism
optimize message for network errors
fix header alignment, Refs #341
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