Backend completely reorganized to limit cyclic imports

backend/load_data/loading_scripts/loadCountries.py

-from backend.models.location import Country
+from backend.models.country import Country
 import os
 import pandas as pd
 from .loadGeneric import LoadGeneric

backend/load_data/loading_scripts/loadCurrencies.py

-from backend.models.location import Currency
+from backend.models.currency import Currency
 import os
 import csv
 from .loadGeneric import LoadGeneric

backend/load_data/loading_scripts/loadUniversities.py

-from backend.models.location import City, Country
-from backend.models.university import University, Campus
+from backend.models.country import Country
+from backend.models.city import City
+from backend.models.university import University
+from backend.models.campus import Campus
 
 import os
 import pandas as pd

backend/migrations/0003_auto_20180909_1547.py

+# Generated by Django 2.0.3 on 2018-09-09 13:47
+
+import backend.models.tools.jSONField
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('backend', '0002_auto_20180909_1455'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='campustaggeditem',
+            name='comment',
+            field=models.TextField(blank=True),
+        ),
+        migrations.AddField(
+            model_name='campustaggeditem',
+            name='importance_level',
+            field=models.CharField(choices=[('-', 'normal'), ('+', 'important'), ('++', 'IMPORTANT')], default='-', max_length=2),
+        ),
+        migrations.AddField(
+            model_name='campustaggeditem',
+            name='usefull_links',
+            field=backend.models.tools.jSONField.JSONField(default=list),
+        ),
+        migrations.AddField(
+            model_name='citytaggeditem',
+            name='comment',
+            field=models.TextField(blank=True),
+        ),
+        migrations.AddField(
+            model_name='citytaggeditem',
+            name='importance_level',
+            field=models.CharField(choices=[('-', 'normal'), ('+', 'important'), ('++', 'IMPORTANT')], default='-', max_length=2),
+        ),
+        migrations.AddField(
+            model_name='citytaggeditem',
+            name='usefull_links',
+            field=backend.models.tools.jSONField.JSONField(default=list),
+        ),
+        migrations.AddField(
+            model_name='countrytaggeditem',
+            name='comment',
+            field=models.TextField(blank=True),
+        ),
+        migrations.AddField(
+            model_name='countrytaggeditem',
+            name='importance_level',
+            field=models.CharField(choices=[('-', 'normal'), ('+', 'important'), ('++', 'IMPORTANT')], default='-', max_length=2),
+        ),
+        migrations.AddField(
+            model_name='countrytaggeditem',
+            name='usefull_links',
+            field=backend.models.tools.jSONField.JSONField(default=list),
+        ),
+        migrations.AddField(
+            model_name='universitytaggeditem',
+            name='comment',
+            field=models.TextField(blank=True),
+        ),
+        migrations.AddField(
+            model_name='universitytaggeditem',
+            name='importance_level',
+            field=models.CharField(choices=[('-', 'normal'), ('+', 'important'), ('++', 'IMPORTANT')], default='-', max_length=2),
+        ),
+        migrations.AddField(
+            model_name='universitytaggeditem',
+            name='usefull_links',
+            field=backend.models.tools.jSONField.JSONField(default=list),
+        ),
+    ]

backend/models/basic_module/__init__.py

+from .basicModule import BasicModule, BasicModuleSerializer, BasicModuleViewSet  # noqa: F401

backend/models/module/basicModule.py → backend/models/basic_module/basicModule.py

 from django.db import models
 from backend.models.my_model import MyModelVersionned, MyModelVersionnedSerializer, MyModelVersionnedViewSet
 from backend.models.tools import JSONField
-from backend.models.tag.tagged_item_validation import validate_content_against_config
-from backend.models.tag.tags_config import USEFULL_LINKS_CONFIG
+from backend.validators.tag import validate_content_against_config
+from backend.validators.tag.tags_config import USEFULL_LINKS_CONFIG
 
 IMPORTANCE_LEVEL = (
     ('-', 'normal'),

backend/models/campus/__init__.py

+from .campus import Campus, CampusViewSet, CampusSerializer, MainCampusViewSet  # noqa: F401
+from .campusTaggedItem import CampusTaggedItem, CampusTaggedItemSerializer, CampusTaggedItemViewSet  # noqa: F401

backend/models/university/campus.py → backend/models/campus/campus.py

 from django.db import models
-from backend.models.module import BasicModule, BasicModuleSerializer, BasicModuleViewSet
-from backend.models.location import City
+from backend.models.basic_module import BasicModule, BasicModuleSerializer, BasicModuleViewSet
+from backend.models.city import City
 from backend.models.university import University
 from django.core.validators import MinValueValidator, MaxValueValidator
 from backend.utils import get_model_config, get_viewset_permissions

backend/models/university/campusTaggedItem.py → backend/models/campus/campusTaggedItem.py

 from django.db import models
-from backend.models.university import Campus
+from backend.models.campus import Campus
 from backend.models.tag import TaggedItem, TaggedItemSerializer, TaggedItemViewSet
 from backend.utils import get_model_config, get_viewset_permissions
 

backend/models/city/__init__.py

+from .city import City, CitySerializer, CityViewSet  # noqa: F401
+from .cityTaggedItem import CityTaggedItem, CityTaggedItemSerializer, CityTaggedItemViewSet  # noqa: F401

backend/models/location/city.py → backend/models/city/city.py

 from django.db import models
-from backend.models.location import Country
+from backend.models.country import Country
 from backend.models.my_model import MyModel, MyModelSerializer, MyModelVersionnedViewSet
 from backend.utils import get_model_config, get_viewset_permissions
 

backend/models/location/cityTaggedItem.py → backend/models/city/cityTaggedItem.py

 from django.db import models
 from backend.models.tag import TaggedItem, TaggedItemSerializer, TaggedItemViewSet
-from backend.models.location import City
+from backend.models.city import City
 from backend.utils import get_model_config, get_viewset_permissions
 
 

backend/models/location/__init__.py → backend/models/country/__init__.py

-from .currency import Currency, CurrencyViewSet, CurrencySerializer  # noqa: F401
-
 from .country import Country, CountrySerializer, CountryViewSet  # noqa: F401
 from .countryScholarship import CountryScholarship, CountryScholarshipViewSet  # noqa: F401
 from .countryDri import CountryDri, CountryDriViewSet  # noqa: F401
 from .countryTaggedItem import CountryTaggedItem, CountryTaggedItemSerializer, CountryTaggedItemViewSet  # noqa: F401
-
-from .city import City, CitySerializer, CityViewSet  # noqa: F401
-from .cityTaggedItem import CityTaggedItem, CityTaggedItemSerializer, CityTaggedItemViewSet  # noqa: F401

backend/models/location/countryDri.py → backend/models/country/countryDri.py

 from django.db import models
-from backend.models.location import Country
-from backend.models.module import DriRestrictedModule, DriRestrictedModuleSerializer, DriRestrictedModuleViewSet
+from backend.models.country import Country
+from backend.models.basic_module import BasicModule, BasicModuleSerializer, BasicModuleViewSet
 from backend.utils import get_model_config, get_viewset_permissions
 
 
-class CountryDri(DriRestrictedModule):
+class CountryDri(BasicModule):
     model_config = get_model_config("CountryDri")
     country = models.ManyToManyField(
         Country, related_name="country_dri")
@@ -14,14 +14,14 @@ class CountryDri(DriRestrictedModule):
         return CountryDriSerializer
 
 
-class CountryDriSerializer(DriRestrictedModuleSerializer):
+class CountryDriSerializer(BasicModuleSerializer):
 
     class Meta:
         model = CountryDri
         fields = '__all__'
 
 
-class CountryDriViewSet(DriRestrictedModuleViewSet):
+class CountryDriViewSet(BasicModuleViewSet):
     permission_classes = get_viewset_permissions("CountryDriViewSet")
     queryset = CountryDri.objects.all()  # pylint: disable=E1101
     serializer_class = CountryDriSerializer

backend/models/location/countryScholarship.py → backend/models/country/countryScholarship.py

 from django.db import models
-from backend.models.location import Country
-from backend.models.module import Scholarship, ScholarshipSerializer, ScholarshipViewSet
+from backend.models.country import Country
+from backend.models.scholarship import Scholarship, ScholarshipSerializer, ScholarshipViewSet
 from backend.utils import get_model_config, get_viewset_permissions
 
 

backend/models/location/countryTaggedItem.py → backend/models/country/countryTaggedItem.py

 from django.db import models
 from backend.models.tag import TaggedItem, TaggedItemSerializer, TaggedItemViewSet
-from backend.models.location import Country
+from backend.models.country import Country
 from backend.utils import get_model_config, get_viewset_permissions
 
 

backend/models/currency/__init__.py

+from .currency import Currency, CurrencyViewSet, CurrencySerializer  # noqa: F401

backend/models/module/__init__.py

-from .basicModule import BasicModule, BasicModuleSerializer, BasicModuleViewSet  # noqa: F401
-from .scholarship import Scholarship, ScholarshipSerializer, ScholarshipViewSet  # noqa: F401
-from .driRestrictedModule import DriRestrictedModule, DriRestrictedModuleSerializer, DriRestrictedModuleViewSet  # noqa: F401