HDF5 2.0 has breaking changes - cmake doesn't set the `HDF5_IS_PARALLEL` variable anymore

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2

Note that, one of the breaking changes in HDF5 2.0.0 is a renaming of HDF5_ENABLE_PARALLEL to HDF5_PROVIDES_PARALLEL (see PR #5716). It seems like the following diff fixes FindHDF5.cmake:

686c686
<         set(HDF5_IS_PARALLEL ${HDF5_ENABLE_PARALLEL})
---
>         set(HDF5_IS_PARALLEL ${HDF5_PROVIDES_PARALLEL})
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