[ewels]

Description of the change

Fixes #191.

• At N4 533 eV (was 879 eV, the Am N4 onset) and At N5 507 eV (was 533 eV).
• Pa O1 310 eV and Pa O2 232 eV (were 223 and 310 eV).
• Np O1 (206 eV) renamed to O3.
• Pm N5 120 eV (was 121 eV, above Pm N4).
• Values from the Gatan EELS Atlas and Elam, Ravel and Sieber (2002), https://doi.org/10.1016/S0969-806X(01)00227-4. For Pm N5 the Atlas has the same value as exSpy, so the value is from Elam et al.
• In test_eels.py and test_edges_range.py, the edge at 533 eV is now At_N4, and At_N5 is at 507 eV.

AI-assisted contribution?

• Is this an AI-assisted contribution? If yes, and non-trivial, link to the accepted proposal:
  - [x] N/A (human-only contribution or trivial change)
  - [ ] Proposal accepted: <link to PR in hyperspy/hyperspy-proposals>

Progress of the PR

• if AI-assisted, Assisted-by: <tool>:<model> in every commit and no AI Co-authored-by: trailer,
• Change implemented (can be split into several points),
• docstring updated (if appropriate),
• update user guide (if appropriate),
• added tests,
• add a changelog entry in the upcoming_changes folder (see upcoming_changes/README.rst),
• Check formatting of the changelog entry (and eventual user guide changes) in the docs/readthedocs.org:exspy build of this PR (link in github checks)
• ready for review.

Minimal example of the bug fix or the new feature

from exspy.material import elements

for el, shells in {"At": ["N3", "N4", "N5"], "Pa": ["O1", "O2"], "Np": ["O2", "O3"], "Pm": ["N4", "N5"]}.items():
    e = elements[el].Atomic_properties.Binding_energies
    print(el, {sh: e[sh]["onset_energy (eV)"] for sh in shells})
# At {'N3': 740.0, 'N4': 533.0, 'N5': 507.0}
# Pa {'O1': 310.0, 'O2': 232.0}
# Np {'O2': 283.0, 'O3': 206.0}
# Pm {'N4': 120.0, 'N5': 120.0}