Add context type tags for grouping sets expressions.
Add polymorphic list state.
Update grouping sets structure to update sub-query structure.
Switch to use grouping sets structure.
Renamed.
Remove MonadCube old implementation.
Remove old tag types.
Update haddocks.
Add finalized grouping power-set and set-lists types.
Update methods for power-set and set-lists state.
Method renamed.
Add Functor instance of AggregatedElements.
Specify cube and rollup key from raw SQL terms.
Update typing around aggregatings.
Update export symbols.
Type renamed.
Remove unused imports.
Add AggregateSet type for sinle grouping set.
Add missing space.
Update with showSpace variation.