add constructor and add more exports

src/AnimalFurFHN.jl

@@ -5,5 +5,5 @@ include("constants.jl")
 include("laplacian.jl")
 include("solver.jl")
 
-export run_simulation   # Make sure this is here!
+export run_simulation, run_simulationG, run_simulationG_no_ode   # Make sure this is here!
 end

src/constants.jl

@@ -22,6 +22,8 @@ struct GSParams
     Dv::Float64  # diffusion rate V
     F::Float64   # feed rate
     k::Float64   # kill rate
+    GSParams(; N::Int, dx::Float64, Du::Float64, Dv::Float64, F::Float64, k::Float64) =
+        new(N, dx, Du, Dv, ϵ, a)
 end
 
 export FHNParams, GSParams