Remove unused imports, do PEP8 and DeprecationWarning cleanups

mayan/apps/metadata/classes.py

@@ -1,7 +1,6 @@
 from django.utils.translation import ugettext_lazy as _
 
-from .models import DocumentTypeMetadataType, MetadataType
-from .tasks import task_add_required_metadata_type, task_remove_metadata_type
+from .models import MetadataType
 
 
 class DocumentMetadataHelper(object):

mayan/apps/metadata/forms.py

@@ -85,4 +85,5 @@ MetadataRemoveFormSet = formset_factory(MetadataRemoveForm, extra=0)
 
 class MetadataTypeForm(forms.ModelForm):
     class Meta:
+        fields = ('name', 'title', 'default', 'lookup')
         model = MetadataType