move inclusion of additional InputData_ext.gdx from Backbone files to seperate...

move inclusion of additional InputData_ext.gdx from Backbone files to seperate includeInputData_ext.inc file

inc/1e_inputs.gms

@@ -64,46 +64,9 @@ $loaddc p_groupPolicy
 $loaddc p_groupPolicy3D
 $gdxin
 
-$gdxin  'input/inputData_WWTP.gdx'
-$loaddcm grid
-$loaddcm node
-$loaddcm flow
-$loaddcm unittype
-$loaddcm unit
-$loaddcm unitUnittype
-$loaddcm fuel
-$loaddcm unitUnit_aggregate
-$loaddcm uFuel
-$loaddcm effLevelGroupUnit
-$loaddcm p_gn
-$loaddcm p_gnn
-$loaddcm p_gnu
-$loaddcm p_unit
-$loaddcm ts_unit
-$loaddcm p_nReserves
-$loaddcm p_nuReserves
-$loaddcm ts_reserveDemand
-$loaddcm p_gnBoundaryPropertiesForStates
-$loaddcm p_gnPolicy
-$loaddcm p_uFuel
-$loaddcm flowUnit
-$loaddcm gngnu_fixedOutputRatio
-$loaddcm gngnu_constrainedOutputRatio
-$loaddcm emission
-$loaddcm p_fuelEmission
-$loaddcm ts_cf
-$loaddcm ts_fuelPriceChange
-$loaddcm ts_influx
-$loaddcm ts_nodeState
-$loaddcm t_invest
-$loaddcm group
-$loaddcm uGroup
-$loaddcm gnuGroup
-$loaddcm gn2nGroup
-$loaddcm gnGroup
-$loaddcm p_groupPolicy
-$loaddcm p_groupPolicy3D
-$gdxin
+$ifthen exist 'input/includeInputData_ext.inc'
+   $$include 'input/includeInputData_ext.inc'
+$endif
 
 $ontext
  * Load stochastic scenarios