Increase the max_length of CodeType.code & NameType.code

This is because the name of the 'local-authority-eng' is longer
than the previous 10 characters allowed.

mapit/migrations/0003_auto_20161205_1050.py

@@ -0,0 +1,25 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.9.1 on 2016-12-05 14:19
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('mapit', '0002_auto_20141218_1615'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='codetype',
+            name='code',
+            field=models.CharField(help_text="A unique code, eg 'ons' or 'unit_id'", max_length=500, unique=True),
+        ),
+        migrations.AlterField(
+            model_name='nametype',
+            name='code',
+            field=models.CharField(help_text="A unique code to identify this type of name: eg 'english' or 'iso'", max_length=500, unique=True),
+        ),
+    ]

mapit/models.py

@@ -346,7 +346,7 @@ class NameType(models.Model):
     # and displayed in the alternative names section.
 
     code = models.CharField(
-        max_length=10, unique=True, help_text="A unique code to identify this type of name: eg 'english' or 'iso'")
+        max_length=500, unique=True, help_text="A unique code to identify this type of name: eg 'english' or 'iso'")
     description = models.CharField(
         max_length=200, blank=True, help_text="The name of this type of name, eg 'English' or 'ISO Standard'")
     objects = models.Manager()
@@ -386,7 +386,7 @@ class CodeType(models.Model):
     # This could be extended to a more generic data store of information on an
     # object, perhaps.
 
-    code = models.CharField(max_length=10, unique=True, help_text="A unique code, eg 'ons' or 'unit_id'")
+    code = models.CharField(max_length=500, unique=True, help_text="A unique code, eg 'ons' or 'unit_id'")
     description = models.CharField(
         max_length=200, blank=True,
         help_text="The name of the code, eg 'Office of National Statitics' or 'Ordnance Survey ID'")