Add multi-kpt support to SinglePointDFTCalculator, fix read_vasp_xml kpoint parsing
Depends on !325 (merged). Implements kpts2ndarray when a user passes a dict to the kpts arg. This simplifies band path construction.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Depends on !325 (merged). Implements kpts2ndarray when a user passes a dict to the kpts arg. This simplifies band path construction.