Add coordinates autocomplete widget & data (#32)

Just tweaks based on what Carl had already written in dce53630 and b97d421a

apps/map/migrations/0054_auto_20180416_0355.py

@@ -0,0 +1,45 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.6 on 2018-04-16 03:55
+from __future__ import unicode_literals
+
+from django.conf import settings
+import django.contrib.gis.db.models.fields
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('gis', '__first__'),
+        ('map', '0053_casestudydraft'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='SpatialRefSys',
+            fields=[
+            ],
+            options={
+                'verbose_name': 'spatial reference system',
+                'proxy': True,
+                'indexes': [],
+            },
+            bases=('gis.postgisspatialrefsys',),
+        ),
+        migrations.AlterField(
+            model_name='casestudy',
+            name='coordinate_reference_system',
+            field=models.ForeignKey(blank=True, default=4326, null=True, on_delete=django.db.models.deletion.CASCADE, to='map.SpatialRefSys'),
+        ),
+        migrations.AlterField(
+            model_name='casestudy',
+            name='location',
+            field=django.contrib.gis.db.models.fields.PointField(srid=4326, verbose_name='Project location'),
+        ),
+        migrations.AlterField(
+            model_name='casestudydraft',
+            name='author',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to=settings.AUTH_USER_MODEL),
+        ),
+    ]