display any user profile pictures until they have been verified by
project admin. When user enters or modifies picture, only they can
see if. If not yet verified, they will see a message saying that
other users can't see it until it has been verified by the project.
If admins have rejected it, user will see a message saying that they
must replace their picture or no one but themselves can see it.
The only known side effect of this is that selection of UOTD is now
includes users with no credit. I will try to fix this.
svn path=/trunk/boinc/; revision=7967
