Detect difference between single and double click

[ksteph]

Currently when the user double clicks on a node while the learning path view is not visible, the first click is interpreted as a request to open and show the learning path view instead of opening the node's content.

Instead if the user double clicks this should be interpreted as a request to see the node's content. This should both open the learning path view and show the suggested path to learn the node and the node's content.