remove dependency on h5py in utils/view_field_diff.py
The <bindir>/utils/view_field_diff
tool produced from <srcdir>/utils/view_field_diff.py
displays the difference between 2 field in a disk file.
We want to remove that dependency and access the data through our python bindings (as illustrated in the <srcdir>/test/fargocapy/explore_seq.py.in
.