implementd adding and removal of tags to/from transactions

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

frontend/src/urls.svelte.js

@@ -8,11 +8,13 @@ export function get(url){
     return fetch(url,{ credentials:'include' });
 }
 
-export function drop(url){
-    return fetch(url,{
-        credentials:'include',
-        method:'DELETE'
-    });
+export function drop(url, payload){
+	let data = {
+		credentials:'include',
+		method:'DELETE'
+	};
+	if (payload) data['body'] = JSON.stringify(payload);
+    return fetch(url,data);
 }
 
 export function eventStream(createHandler,updateHandler,deleteHandler){
@@ -54,4 +56,4 @@ export function target(code){
     }
 
     return altered;
-}
+}