PyStratify 0.10.3

A point source in an exterior half-space of a film stack (above or below it) lost the power it couples into the stack's guided modes, so total rates near lossless guides were low (by 20%, 30 nm above 200 nm of TiO2 on glass) while the solve reported convergence. Lossy stacks and sources inside a finite layer were unaffected.

Found by the new public benchmark benchmarks/emitter_references.py against smuthi; see benchmarks/EMITTER_REFERENCES.md.