added impeller to Workout model and saving of this in dataprep

need more work and testing

rowers/models.py

@@ -2734,6 +2734,7 @@ class Workout(models.Model):
                                choices=privacychoices)
     rankingpiece = models.BooleanField(default=False,verbose_name='Ranking Piece')
     duplicate = models.BooleanField(default=False,verbose_name='Duplicate Workout')
+    impeller = models.BooleanField(default=False,verbose_name='Impeller')
 
     def save(self, *args, **kwargs):
         user = self.user