0.7.0

API change: __bool__ of all containers now raises a ValueError.

API change: IndexHierarchy.iter_label now iterates over realized labels.

API change: IndexBase.union, IndexBase.intersection no longer automatically unpack values from ContainerOperand subclasses.

API change: Container operands used with binary equality operators will raise if sizes are not equivalent

API change: Frame.from_xlsx, as well as StoreConfig now set trim_nadir to False by default.

API change: Series.relabel_add_level to Series.relabel_level_add, Series.relabel_drop_level to Series.relabel_level_drop, Frame.relabel_add_level to Frame.relabel_level_add, Frame.relabel_drop_level to Frame.relabel_level_drop, Index.add_level to Index.level_add, IndexHierarchy.add_level to IndexHierarcchy.level_add, IndexHierarchy.drop_level to IndexHierarchy.level_drop.