defer (re)opening checkpoint files until we need to

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Issue #1030 closed
Roland Haas created an issue

this patch defers opening checkpoint files until we need to do so because either we need to browse them or open a dataset for reading. This speeds up open_one_file_at_a_time since it will not open a hdf5 file that was already parsed and does not contain useful datasets.

Keyword: CarpetIOHDF5

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