nimhdf5 CI

Fix `DEBUG_HDF5` and some minor leaks, add `fromH5` for `ref objects` #217

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2 errors and 10 warnings

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A custom '=destroy' hook which takes a 'var T' parameter is deprecated; it should take a 'T' parameter [Deprecated]

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

A custom '=destroy' hook which takes a 'var T' parameter is deprecated; it should take a 'T' parameter [Deprecated]

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

A custom '=destroy' hook which takes a 'var T' parameter is deprecated; it should take a 'T' parameter [Deprecated]

`=destroy`(attrs.parent_id) can raise an unlisted exception: Exception [Effect]

A custom '=destroy' hook which takes a 'var T' parameter is deprecated; it should take a 'T' parameter [Deprecated]

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

A custom '=destroy' hook which takes a 'var T' parameter is deprecated; it should take a 'T' parameter [Deprecated]

`=destroy`(grp.attrs) can raise an unlisted exception: Exception [Effect]