Always write a complete results file with Cpp runtime

This simplifies the analysis of initialization errors
and it works around crashes of OMEdit,
see issue #8008 (OMEdit crashes if a simulation fails or is canceled).

- SimManager.cpp: write out values after initialization,
  also in case of failure for the analysis of intermediate results
- SolverDefaultImplementation: decouple writing of variable names
  from initialization of solver. Write them before first values instead.

OMCompiler/SimulationRuntime/cpp/Core/SimController/SimManager.cpp

@@ -124,6 +124,7 @@ void SimManager::initialize()
     // Reset debug ID
     _dbgId = 0;
 
+    _solver->setStartTime(_tStart);
     try
     {
         // Build up system and update once
@@ -133,10 +134,13 @@ void SimManager::initialize()
     {
         LOGGER_WRITE("SimManager: Could not initialize system", LC_INIT, LL_ERROR);
         LOGGER_WRITE("SimManager: " + string(ex.what()), LC_INIT, LL_ERROR);
-        //ex << error_id(SIMMANAGER);
+        // Write current values as they might help to analyse the error
+        _solver->solve(ISolver::RECORDCALL);
         throw ModelicaSimulationError(SIMMANAGER, "Could not initialize system",
                                       string(ex.what()), LOGGER_IS_SET(LC_INIT, LL_ERROR));
     }
+    // Write initial values
+    _solver->solve(ISolver::RECORDCALL);
 
     if (_timeevent_system)
     {

OMCompiler/SimulationRuntime/cpp/Core/Solver/SolverDefaultImplementation.cpp

@@ -42,6 +42,7 @@ SolverDefaultImplementation::SolverDefaultImplementation(IMixedSystem* system, I
     , _events               (NULL)
     , _solverStatus         (ISolver::UNDEF_STATUS)
     , _outputCommand        (IWriteOutput::WRITEOUT)
+    , _writeoutput_system   (NULL)
 {
   _state_selection = shared_ptr<SystemStateSelection>(new SystemStateSelection(system));
 
@@ -114,14 +115,10 @@ void SolverDefaultImplementation::initialize()
   IContinuous* continous_system = dynamic_cast<IContinuous*>(_system);
   IEvent* event_system =  dynamic_cast<IEvent*>(_system);
   ITime* timeevent_system = dynamic_cast<ITime*>(_system);
-  IWriteOutput* writeoutput_system = dynamic_cast<IWriteOutput*>(_system);
+
   // Set current start time to the system
   timeevent_system->setTime(_tCurrent);
 
-
-  if(_settings->getGlobalSettings()->getOutputPointType() != OPT_NONE)
-    writeoutput_system->writeOutput(IWriteOutput::HEAD_LINE);
-
   // Allocate array with values of zero functions
   if (_dimZeroFunc != event_system->getDimZeroFunc())
   {
@@ -202,14 +199,18 @@ void SolverDefaultImplementation::writeToFile(const int& stp, const double& t, c
 
   LOGGER_STATUS("Running", t, h);
 
-  if(_settings->getGlobalSettings()->getOutputPointType()!= OPT_NONE)
+  if (_settings->getGlobalSettings()->getOutputPointType() != OPT_NONE)
   {
-    IWriteOutput* writeoutput_system = dynamic_cast<IWriteOutput*>(_system);
-
-    if(_outputCommand & IWriteOutput::WRITEOUT)
+    // write header on first call
+    if (_writeoutput_system == NULL)
     {
-      writeoutput_system->writeOutput(_outputCommand);
-
+      _writeoutput_system = dynamic_cast<IWriteOutput*>(_system);
+      _writeoutput_system->writeOutput(IWriteOutput::HEAD_LINE);
+    }
+    // write values
+    if (_outputCommand & IWriteOutput::WRITEOUT)
+    {
+      _writeoutput_system->writeOutput(_outputCommand);
     }
   }
   checkTimeout();

OMCompiler/SimulationRuntime/cpp/Core/Solver/SolverDefaultImplementation.h

@@ -113,6 +113,9 @@ class BOOST_EXTENSION_SOLVER_DECL SolverDefaultImplementation : public Simulatio
   IWriteOutput::OUTPUT
     _outputCommand;           ///< Controls the output
 
+  IWriteOutput
+    *_writeoutput_system;
+
 private:
   /// Definition of signum function
   inline static int sgn (const double &c)