Calculate forecast offset even for one scenario

Previously forecast offset `df_scenario` was computed only when number of scenarios was
greater than one. Long-term scenario data should use a special label in the `f` dimension
in all cases.

CHANGELOG.md

@@ -45,6 +45,27 @@ All notable changes to this project will be documented in this file.
 - Limiting the provision of online reserve based on the online variable
 - Sample probability bug from scenario reduction (probability of single scenario above one)
 
+
+## 1.1.5 - 2020-11-28
+### Fixed
+- Long-term scenario data when using only one scenario
+
+
+## 1.1.4 - 2019-11-02
+### Fixed
+- Sample probability bug from scenario reduction
+
+
+## 1.1.3 - 2019-10-24
+### Changed 
+- Scenario reduction is done based on total available energy
+
+
+## 1.1.2 - 2019-10-23
+### Changed 
+- Maintain original scenario labels after reduction
+
+
 ## [1.1] - 2019-04-17
 ### Added
 - New model setting 't_perfectForesight' tells the number of time steps (from 

defModels/scheduleInit_temp.gms

@@ -140,6 +140,9 @@ if (mType('schedule'),
     mf_realization('schedule', 'f00') = yes;
     mf_central('schedule', f) = no;
     mf_central('schedule', 'f02') = yes;
+    
+    // Define special forecast label that holds scenario data
+    //mf_scenario('schedule', 'scen') = yes;
 
     // Define forecast probabilities (weights)
     p_mfProbability('schedule', f) = 0;

inc/3b_periodicLoop.gms

@@ -466,7 +466,7 @@ loop(mf_realization(mSolve, f_),
 );
 // Central forecast for the long-term scenarios comes from a special forecast label
 Option clear = df_scenario;
-if(mSettings(mSolve, 'scenarios') > 1,
+if(mSettings(mSolve, 'scenarios') >= 1,
     loop((msft(ms_central(mSolve, s), f, t), mf_scenario(mSolve, f_)),
         df_scenario(ft(f, t)) = ord(f_) - ord(f);
     );

timeAndSamples_temp.inc

@@ -20,6 +20,8 @@ $offtext
 * =============================================================================
 
     s "Samples from historical periods" / s000 * s999 /
-    f "Forecasts for the short term" / f00 * f99 /
+    f "Forecasts for the short term" / f00 * f99,
+                                       scen 'long-term scenarios',    
+                                     /
     t "Model time steps" / t000000 * t017568 /
     scenario "Long-term scenarios" / scen00 /