Improving cell grouping UX

[minsa110]

I think the cell grouping experience can definitely be improved here and think that it would benefit a lot of users! Not to make this into a spec, and understanding that this won't be "to do now", but just brainstorming here:

• Ability to create more than 2 groups
• Intuitive key bindings for grouping cells, running them, and then ungrouping them
• Would be nice to have the grouping persist via git (e.g. through metadata)
• Creating custom names for groups
• Being able to easily copy and paste a group of cells to a different notebook
• Being able to always start a notebook with a specific group (e.g. "I use similar imports all the time")

[DonJayamanne]

Given that we have a new way built into core for renning dependant cells, it was discussed that this feature would be deprecated in favour of whats in core.
Hence closing this issue.