EAMxx: fix bug when aliasing subfields

[bartgol]

Add parent of source field to the newly created fields. Add test to ensure this works as expected.

[BFB]

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This bug was sneaky to find. Should not affect any existing code, since if this affected your code, it would have likely caused a crash somewhere (not guaranteed, though, so it may indeed improve someone's life).

[mahf708]

How did you find it though 👀 asking for science

[bartgol]

How did you find it though 👀 asking for science

I was calling

  print_field_hyperslab(f.alias("blah"));

where f was a subfield. This caused problems when we access the view, since, without a parent field, the code tries to happily use get_view instead of get_strided_view, which leads to errors due to wrong calculation of view sizes from the allocation.