ruf cleanup imports, bigly.

core/models/troggle.py

@@ -1,26 +1,12 @@
-import datetime
-import os
-import re
-import resource
-import string
 from decimal import Decimal, getcontext
-from subprocess import call
 from urllib.parse import urljoin
 
 getcontext().prec = 2  # use 2 significant figures for decimal calculations
 
-from django.conf import settings
-from django.contrib import admin
-from django.contrib.auth.models import User
-from django.contrib.contenttypes.models import ContentType
-from django.core.files.storage import FileSystemStorage
 from django.db import models
-from django.template import Context, loader
 from django.urls import reverse
 
 import settings
-import troggle.core.models.survex
-from troggle.core.utils import get_process_memory
 
 """This file declares TroggleModel which inherits from django.db.models.Model 
 All TroggleModel and models.Model subclasses inherit persistence in the django relational database. This is known as