Item model, fix deletion of all attachments

Item model delete all attachments on item deletion, but it should check
if same attachment isn't used somewhere else.

src/Model/Item.php

@@ -1028,6 +1028,7 @@ class Item extends BaseObject
 		 * This only applies to photos uploaded from the photos page. Photos inserted into a post do not
 		 * generate a resource-id and therefore aren't intimately linked to the item.
 		 */
+		/// @TODO: this should first check if photo is used elsewhere
 		if (strlen($item['resource-id'])) {
 			Photo::delete(['resource-id' => $item['resource-id'], 'uid' => $item['uid']]);
 		}
@@ -1038,6 +1039,7 @@ class Item extends BaseObject
 		}
 
 		// If item has attachments, drop them
+		/// @TODO: this should first check if attachment is used elsewhere
 		foreach (explode(",", $item['attach']) as $attach) {
 			preg_match("|attach/(\d+)|", $attach, $matches);
 			if (is_array($matches) && count($matches) > 1) {

vagrant.local.yaml

@@ -0,0 +1,2 @@
+server:
+  memory: "1024" # MB