Add sublists

[digitalethics]

Very often a particular project requires to be involved in different functional areas. Having to separate these related tasks into lists of their own limits productivity and very quickly clutters the TDL interface.

The easiest solution to this problem would be to introduce sublists that could be toggled via tabs within a particular project list. This would allow users to group all tasks within one project list yet give enough flexibility to itemise them into functional groups such as strategy, policy, social media, fundraising, and website to give an example for a typical non-technical project workflow.