Postsendfix

Fixed functionality to avoid errors when send at 'upvoting' and creating post:
- If a user now creates a new post and submits it, it does not get sent to the user itself
- If a user select to give a received post an 'upvote':
  ~ It does not get resent to owner of the post
  ~ If there are no users left that has not received it, post is not resent
  ~ If there are enough users, it get sent to 'nrOfReceivers'
 ~ If there are users left, but less than 'nrOfReceivers', it gets sent to the rest of the user who has not received it.