…definition of alpha of /scheme/structure.cpp. Fixed a bug in how the E*(n2-n1) term in updating the multilevel polarization was working. Rewrote most of the multilevel-atom.ctl example to be more transparent with agreement with SALT. Still having trouble getting multilevel-atom.ctl to yield non-zero fields, I think this is a field initialization issue.

…ns for gain media in MEEP. The results have been verified against my personal implementation of the oscillator equations in 1D.

…sing, including the two ~0 terms not normally written in the oscillator model equations. Candidate to be merged back into the master branch.

The multilevel atom susceptibility is now working and verified against independent code.