Resolve "Clarification System"

Closes #84 (closed)

core/migrations/0016_solutioncomment.py

+# Generated by Django 2.1.4 on 2019-05-14 15:00
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0015_feedbacklabel_colour'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='SolutionComment',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('text', models.TextField()),
+                ('created', models.DateTimeField(auto_now_add=True)),
+                ('modified', models.DateTimeField(auto_now=True)),
+                ('of_line', models.PositiveIntegerField()),
+                ('of_submission_type', models.ForeignKey(on_delete=django.db.models.deletion.PROTECT, related_name='solution_comments', to='core.SubmissionType')),
+                ('of_user', models.ForeignKey(on_delete=django.db.models.deletion.PROTECT, related_name='solution_comments', to=settings.AUTH_USER_MODEL)),
+            ],
+        ),
+    ]