Fix migrations (replace JSON field etc.)

aleksis/apps/alsijil/migrations/0001_initial.py

 # Generated by Django 3.0.6 on 2020-05-29 10:29
 
-import django.contrib.postgres.fields.jsonb
 import django.contrib.sites.managers
 import django.db.models.deletion
 from django.db import migrations, models
@@ -33,7 +32,7 @@ class Migration(migrations.Migration):
                 ),
                 (
                     "extended_data",
-                    django.contrib.postgres.fields.jsonb.JSONField(
+                    models.JSONField(
                         default=dict, editable=False
                     ),
                 ),
@@ -92,7 +91,7 @@ class Migration(migrations.Migration):
                 ),
                 (
                     "extended_data",
-                    django.contrib.postgres.fields.jsonb.JSONField(
+                    models.JSONField(
                         default=dict, editable=False
                     ),
                 ),
@@ -140,7 +139,7 @@ class Migration(migrations.Migration):
                 ],
                 "unique_together": {("lesson_period", "week", "person")},
             },
-            managers=[("objects", django.contrib.sites.managers.CurrentSiteManager()),],
+            managers=[],
         ),
         migrations.CreateModel(
             name="LessonDocumentation",
@@ -156,7 +155,7 @@ class Migration(migrations.Migration):
                 ),
                 (
                     "extended_data",
-                    django.contrib.postgres.fields.jsonb.JSONField(
+                    models.JSONField(
                         default=dict, editable=False
                     ),
                 ),
@@ -202,6 +201,6 @@ class Migration(migrations.Migration):
                 ],
                 "unique_together": {("lesson_period", "week")},
             },
-            managers=[("objects", django.contrib.sites.managers.CurrentSiteManager()),],
+            managers=[],
         ),
     ]

aleksis/apps/alsijil/migrations/0002_excuse_type.py

 # Generated by Django 3.0.8 on 2020-07-10 10:46
 
-import django.contrib.postgres.fields.jsonb
 import django.contrib.sites.managers
 import django.db.models.deletion
 from django.db import migrations, models
@@ -28,7 +27,7 @@ class Migration(migrations.Migration):
                 ),
                 (
                     "extended_data",
-                    django.contrib.postgres.fields.jsonb.JSONField(
+                    models.JSONField(
                         default=dict, editable=False
                     ),
                 ),

aleksis/apps/alsijil/migrations/0003_extra_mark.py

 # Generated by Django 3.0.8 on 2020-07-12 12:43
 
-import django.contrib.postgres.fields.jsonb
 import django.contrib.sites.managers
 import django.db.models.deletion
 from django.db import migrations, models
@@ -28,7 +27,7 @@ class Migration(migrations.Migration):
                 ),
                 (
                     "extended_data",
-                    django.contrib.postgres.fields.jsonb.JSONField(
+                    models.JSONField(
                         default=dict, editable=False
                     ),
                 ),

aleksis/apps/alsijil/migrations/0008_global_permissions.py

@@ -18,7 +18,6 @@ class Migration(migrations.Migration):
                 ('extended_data', models.JSONField(default=dict, editable=False)),
             ],
             options={
-                "default_permissions": (),
                 'permissions': (('view_week', 'Can view week overview'), ('register_absence', 'Can register absence'), ('list_personal_note_filters', 'Can list all personal note filters')),
                 'managed': False,
             },

aleksis/apps/alsijil/migrations/0010_events_extra_lessons.py

@@ -55,7 +55,7 @@ class Migration(migrations.Migration):
         migrations.AlterField(
             model_name='lessondocumentation',
             name='year',
-            field=models.IntegerField(blank=True, default=aleksis.apps.chronos.util.date.get_current_year, null=True, verbose_name='Year'),
+            field=models.IntegerField(blank=True, null=True, verbose_name='Year'),
         ),
         migrations.AlterField(
             model_name='personalnote',
@@ -70,7 +70,7 @@ class Migration(migrations.Migration):
         migrations.AlterField(
             model_name='personalnote',
             name='year',
-            field=models.IntegerField(blank=True, default=aleksis.apps.chronos.util.date.get_current_year, null=True, verbose_name='Year'),
+            field=models.IntegerField(blank=True, null=True, verbose_name='Year'),
         ),
         migrations.AlterUniqueTogether(
             name='lessondocumentation',