Adds a Confirm Delete page and actually delete the assets.

models/Asset.php

@@ -485,6 +485,14 @@ class Asset
 		if (!unlink(ASSETSDIR . '/' . $this->subdir . '/' . $this->filename))
 			return false;
 
+		$db->query('
+			UPDATE tags
+			SET id_asset_thumb = 0
+			WHERE id_asset_thumb = {int:id_asset} AND kind = "Album"',
+			[
+				'id_asset' => $this->id_asset,
+			]);
+
 		$db->query('
 			DELETE FROM assets_meta
 			WHERE id_asset = {int:id_asset}',