#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/migrations/0004_auto_20220210_1402.py

@@ -0,0 +1,39 @@
+# Generated by Django 3.1.3 on 2022-02-10 13:02
+
+from django.db import migrations, models
+
+
+def migrate_actions(apps, schema_editor):
+    CompensationAction = apps.get_model('compensation', 'CompensationAction')
+    actions = CompensationAction.objects.all()
+
+    for action in actions:
+        action_type = action.action_type or []
+        action.action_type_tmp.set(action_type)
+        action.save()
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('codelist', '0001_initial'),
+        ('compensation', '0003_auto_20220202_0846'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='compensationaction',
+            name='action_type_tmp',
+            field=models.ManyToManyField(blank=True, limit_choices_to={'code_lists__in': [1026], 'is_archived': False, 'is_selectable': True}, related_name='_compensationaction_action_type_+', to='codelist.KonovaCode'),
+        ),
+        migrations.RunPython(migrate_actions),
+        migrations.RemoveField(
+            model_name='compensationaction',
+            name='action_type',
+        ),
+        migrations.RenameField(
+            model_name='compensationaction',
+            old_name='action_type_tmp',
+            new_name='action_type',
+        )
+    ]