Ability to open a project even when some nodes are defined on non-running or inaccessible computes

[jean-christophe-manciot]

Is your feature request related to a problem? Please describe. When a project contains some nodes defined on remote computes which are inaccessible, opening the whole project leads to a blank page, even though there might be some other accessible nodes on it.

Describe the solution you'd like I propose to open the project containing some inaccessible nodes and:

• change the color of all inaccessible nodes/computes in the topology summary area from red (not started) to black (inaccessible)
• mark all inaccessible nodes on the main area with a special visual effect such as a special icon over its symbol such as a no entry sign; for instance:
• allow the user to start all affected nodes as soon as their respective remote compute becomes accessible
• add a notification to the user in the GNS3 GUI console area which lists all inaccessible computes and nodes