SPACE_STRATEGY sets the file space handling
strategy, specifies persisting free-space or not (
persist), and sets the free-space section size
threshold in the file creation property list
This setting cannot be changed for the life of the file.
As the H5F_FSPACE_STRATEGY_AGGR and H5F_FSPACE_STRATEGY_NONE strategies do not use the free-space managers, the persist and threshold settings will be ignored for those strategies.