Fixes "Use of initialized value" errors when sending friend requests.
Removed cookie_jar method. Cookies stored in memory only.
Moved login functions to more logical location in the code.
Fixed some docs typos.
logged_in will return false if my_friend_id couldn't be set for some reason.
If already_commented can't load the page, or if my_friend_id isn't set, it will return a false "true" value and set $myspace->error to a message describing the problem.
Added mortality to all "scripts" - if login fails, the script will die with "Login Failed". This prevents continuing with unpredictable results.