#112 WIP: Restructure CompensationAction

* changes action_type from ForeignKey into M2M
* adds migration
* changes form widget
* WIP: changes rendering on detail view of compensation
* TEST NOT CHECKED YET!

compensation/managers.py

@@ -8,17 +8,6 @@ Created on: 14.10.21
 from django.db import models
 
 
-class CompensationActionManager(models.Manager):
-    """ Holds default db fetch setting for this model type
-
-    """
-    def get_queryset(self):
-        return super().get_queryset().select_related(
-            "action_type",
-            "action_type__parent"
-        )
-
-
 class CompensationStateManager(models.Manager):
     """ Holds default db fetch setting for this model type