extract hasOnlySubstanceUnits from Species

src/readsbml.jl

@@ -172,6 +172,7 @@ function extractModel(mdl::VPtr)::Model
             get_string(sp, :Species_getCompartment),
             formula,
             charge,
+            ccall(sbml(:Species_getHasOnlySubstanceUnits), Cint, (VPtr,), sp) != 0,
             getNotes(sp),
             getAnnotation(sp),
         )

src/structs.jl

@@ -82,9 +82,10 @@ struct Species
     compartment::String
     formula::Maybe{String}
     charge::Maybe{Int}
+    only_substance_units::Bool
     notes::Maybe{String}
     annotation::Maybe{String}
-    Species(na, co, f, ch, no = nothing, a = nothing) = new(na, co, f, ch, no, a)
+    Species(na, co, f, ch, osu, no = nothing, a = nothing) = new(na, co, f, ch, osu, no, a)
 end
 
 """