Module stability

Module stability 

Source
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Stability analysis: decay index, force balance, eigenvalue analysis.

Port of stability_analyzer.py (192 lines) and force_balance.py (103 lines).

Functionsยง

analyze_stability
Full stability analysis: eigenvalue decomposition of the stiffness matrix.
calculate_forces
Calculate forces acting on a current-carrying plasma ring.
decay_index
Calculate the decay index at a given position.
solve_force_balance
Newton-Raphson force balance solver.