recursively hoist regions that duplicate their parent #463
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close #368
the main problem this ticket tries to solve is: currently TSML UI will not show the regions dropdown if it's all grouped by a single top-level region. the reason for this is that we remove filters that apply to every meeting. (if every meeting was in the morning, for example, we would not show the Any Time filter because it would not have any utility)
this solves this by removing regions that have all the meetings of their parent region. this has the effect of "hoisting" regions to be more useful. for example:
becomes