Add views to Create / Edit / Delete a PartAttachment

- Buttons to edit or delete existing attachments
- Button to add a new attachment
- Fixed conflicting migrations

InvenTree/part/migrations/0012_part_active.py

@@ -14,5 +14,10 @@ class Migration(migrations.Migration):
             model_name='part',
             name='active',
             field=models.BooleanField(default=True, help_text='Is this part active?'),
+        ),
+		migrations.AddField(
+            model_name='partattachment',
+            name='comment',
+            field=models.CharField(blank=True, help_text='File comment', max_length=100),
         ),
     ]

InvenTree/part/migrations/0012_partattachment_comment.py

@@ -1,18 +0,0 @@
-# Generated by Django 2.2 on 2019-04-28 12:31
-
-from django.db import migrations, models
-
-
-class Migration(migrations.Migration):
-
-    dependencies = [
-        ('part', '0011_auto_20190428_0841'),
-    ]
-
-    operations = [
-        migrations.AddField(
-            model_name='partattachment',
-            name='comment',
-            field=models.CharField(blank=True, help_text='File comment', max_length=100),
-        ),
-    ]

InvenTree/part/migrations/0014_partattachment_comment.py

@@ -1,18 +0,0 @@
-# Generated by Django 2.2 on 2019-04-30 23:34
-
-from django.db import migrations, models
-
-
-class Migration(migrations.Migration):
-
-    dependencies = [
-        ('part', '0013_auto_20190429_2229'),
-    ]
-
-    operations = [
-        migrations.AddField(
-            model_name='partattachment',
-            name='comment',
-            field=models.CharField(blank=True, help_text='Attachment description', max_length=100),
-        ),
-    ]