update TODOs

TODO.md

@@ -17,25 +17,28 @@
 
 ### Required
 
-- [ ] Hash Passwords
-- [ ] Deactivation of idle users with reactivation procedure
-- [ ] Mangement of security mechanism(s)
-- [ ] Manage user name
+- [x] Hash Passwords
+- [x] Deactivation of idle users
+- [x] Reactivation procedure for idle users
+- [x] Mangement of security mechanism(s)
+- [x] Manage user name
 
 ### Optional
 
 - [ ] Manage further metadata
         (E-mail, avatar, (XMPP?))
+- [ ] Make idle for users time configurable
 - [ ] Close and delete account
+- [ ] Imlement Challenge-Response security mechanism
 
 ## Product management
 
 ### Required
 
-- [ ] Show product amount in stock
-- [ ] Correct product amount in stock
-- [ ] Book product amount changes
-- [ ] Manage product metadata
+- [x] Show product amount in stock
+- [x] Correct product amount in stock
+- [x] Book product amount changes
+- [x] Manage product metadata
         (name, unit, bundle, price, category, EAN, supplier)
 - [ ] JSON-Export like in matemat