Provide more detailed information on failure to traverse an external link
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Component - C Library
- Dominant language
- C
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Description
According to [this report](https://forum.hdfgroup.org/t/can-we-use-external-links-to-read-only-data-in-writable-files/9390/5) it appears that the library does not distinguish between failed external link traversal due to file access mode `EACCES (Permission denied)` or file existence `ENOENT (No such file or directory)`. The error message in both cases reads:
```
#008: ../../../src/H5Fint.c line 738 in H5F_prefix_open_file(): unable to open file, file name = 'target.h5', temp_file_name = 'target.h5'
major: File accessibilty
minor: Unable to open file
```
which, in this case, is ambiguous. How can we to provide more detailed error information to remove this kind of ambiguity?
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