Add a Restricted user level. Restricted users are level 10, below
Members. New users start out as Restricted if they sign up from a proxy
or an IP recently used by another user.
Restricted users can't update or edit any public content on the site
until they verify their email address, at which point they're promoted
to Member. Restricted users are only allowed to do personal actions
like keep favorites, keep favgroups and saved searches, mark dmails as
read or deleted, or mark forum posts as read.
The restricted state already existed before, the only change here is
that now it's an actual user level instead of a hidden state. Before it
was based on two hidden flags on the user, the `requires_verification`
flag (set when a user signs up from a proxy, etc), and the `is_verified`
flag (set after the user verifies their email). Making it a user level
means that now the Restricted status will be shown publicly.
Introducing a new level below Member means that we have to change every
`is_member?` check to `!is_anonymous` for every place where we used
`is_member?` to check that the current user is logged in.
Hide banned artist pages from anonymous (logged out) users. Partial
revert of 6b066f2ca. Artists sometimes ask us to remove all their
information from the site, including their artist profile. It's easier
to hide their profile than to explain to Japanese artists that a) we're
under no obligation to remove their profile and b) we need to keep it to
maintain the ban on their content that they asked for.
Remove the ability to edit an artist's wiki page directly from the
artist edit page. Instead the artist edit page has a link to open the
wiki edit page if you need to edit the wiki too.
Fixes an error being thrown when renaming an artist with a wiki page.
The problem is that changing the artist's name breaks the artist's
association with the old wiki page. Rails really wants nested
associations to be based on immutable IDs, not on mutable names, so
dealing with this correctly is difficult.
We don't really want to encourage people to create wiki pages for
artists to begin with, since they're usually just used to duplicate
the artist urls. Making it less convenient to edit artist wiki pages is
an intentional change to discourage creating unnecessary artist wikis.
Finally, this fixes an exploit where it was possible to edit locked wiki
pages through the artist edit page.
