0.5.9

Fixed issue in __slots__ usage of derived Containers.

Implemented StoreConfig and StoreConfigMap classes, and updated all Store and Bus interfaces to use them.

Implemented tracking of Store file modification times, and implemented raising exceptions for any unexpected file modifications.

Improved handling of reading XLSX files with trailing all-empty rows resulting from style formatting across empty data.

Improved HDF5 reading so as to reduce memory overhead.