Bugs in main

• socketIO doesn't work (56676e24 was not good..)
• every old user need role "user" (set manually)

@larsmeiendresch maybe you can fix this:

• old tours have multiple start-pages (solve by SQl-query? add one in the comments)
• no emails
• only some users: user-management and profile "type NoneType doesn't define round method" but only for some users, think that has something to do with the function round used by the used quota calculation (which also not calculating)