Client-side grouping

- Cusomizations made to bootstrap-table-group-by.js
- Group by part name
- Display total stock count per group
- Only group if there are more than 1 item in the group
- Groups send checkbox signals through appropriately!

InvenTree/stock/models.py

@@ -183,6 +183,9 @@ class StockItem(models.Model):
     def get_absolute_url(self):
         return reverse('stock-item-detail', kwargs={'pk': self.id})
 
+    def get_part_name(self):
+        return self.part.full_name
+
     class Meta:
         unique_together = [
             ('part', 'serial'),