If the post is owned by Visitor, do not show the link because no one
is allowed to see Visitor's profile. If the current user is Visitor,
do not show the link because Visitor is not allowed to view anyone's
profile.
- Added about a hundred tests for Collaboration system, Post, and Thread
permissions
- Cleaned up code tested by the aforementioned tests
- Fixed all Test::WWW::Mechanize tests and updated the skeleton. Should be
usable now.