#158 is_pik added

* adds model and form mixin for PIK
* integrates mixins for compensation, ema and ecoaccount
* adds migration files
* extends API
* extends API test data
* adds is_xy fields to compensation, ema and ecoaccount reports
* adds is_pik information to detail views
* adds/updates translations

compensation/models/compensation.py

@@ -257,7 +257,22 @@ class CoherenceMixin(models.Model):
         abstract = True
 
 
-class Compensation(AbstractCompensation, CEFMixin, CoherenceMixin):
+class PikMixin(models.Model):
+    """ Provides PIK flag as Mixin
+
+    """
+    is_pik = models.BooleanField(
+        blank=True,
+        null=True,
+        default=False,
+        help_text="Flag if compensation is a 'Produktonsintegrierte Kompensation'"
+    )
+
+    class Meta:
+        abstract = True
+
+
+class Compensation(AbstractCompensation, CEFMixin, CoherenceMixin, PikMixin):
     """
     Regular compensation, linked to an intervention
     """