Fix `DEBUG_HDF5` and some minor leaks, add `fromH5` for `ref objects` · Vindaar/nimhdf5@b0409bc

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close(h5id, "") can raise an unlisted exception: Exception [Effect]

close(attr) can raise an unlisted exception: Exception [Effect]

close(dset) can raise an unlisted exception: Exception [Effect]

imported and not used: 'sequtils' [UnusedImport]

Compiling without Blosc support! [User]

conversion to enum with holes is unsafe: T(i) [HoleEnumConv]

Exception can raise an unlisted exception: Exception [Effect]

close(h5id, "") can raise an unlisted exception: Exception [Effect]

close(attr) can raise an unlisted exception: Exception [Effect]

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