rewrote the printdiffusion function.  it should work well for two-layer systems with any component/compartment combination.  i also trimmed down the number of species and reactions quite a bit.  there is only one "outer" species per grid location (per unique underlying species ID).  so it should be faster.
rewrote the printdiffusion function.  it should work well for two-layer systems with any component/compartment combination.  i also trimmed down the number of species and reactions quite a bit.  there is only one "outer" species per grid location (per unique underlying species ID).  so it should be faster.

MyersResearchGroup/iBioSim,MyersResearchGroup/iBioSim,MyersResearchGroup/iBioSim