Make papers into modules, instead of structs; add StartupCostsFormulation

src/model/formulations/ArrCon2000/ramp.jl

@@ -5,7 +5,7 @@
 function _add_ramp_eqs!(
     model::JuMP.Model,
     g::Unit,
-    formulation::ArrCon2000,
+    formulation::ArrCon2000.Ramping,
 )::Nothing
     # TODO: Move upper case constants to model[:instance]
     RESERVES_WHEN_START_UP = true

src/model/formulations/ArrCon2000/structs.jl

@@ -9,4 +9,10 @@ Formulation described in:
     to an electricity spot market. IEEE Transactions on power systems, 15(3), 
     1098-1104.
 """
-struct ArrCon2000 <: RampingFormulation end
+module ArrCon2000
+
+import ..RampingFormulation
+
+struct Ramping <: RampingFormulation end
+
+end