Power, force, and torque in Mie scattering

This test validates the algorithms implemented in scuff-em for computing the power, force, and torque (PFT) on bodies irradiated by external fields. The test uses the [scuff-scatter][scuff-scatter] application module to compute the PFT for a lossy dielectric sphere irradiated by a circularly-polarized plane wave and compares the results to the predictions of Mie scattering theory.