Grouping and annotation

I think it would be real useful to be able to group a bunch of tasks and then adding annotation to it. e.g. a section of the tree may be for attacking, and instead of commented each task individually, we want to group those tasks and annotate them. Grouping would be good if they can be assigned a color so visually we can tell a bunch of tasks are in what group, when mouse over the group you can see the annotation.
 
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