Don't raise exception if user is author of post.

It's possible to (un)mark as nsfw if you're either a mod
of the subreddit or author of the submission.
Handle new dataformat of subreddit list.
Handle non-public subreddit contributors edge case.

Accessing a subreddits contributors require user/pswd access for
public subreddits. For non-publc subreddits (protected/private)
only access is required.
Also evict rising listing after approve/remove.