[AppDB] - move $_SESSION['current'] manipulation into user class

[Chris Morgan]

user::login() was setting $this->iUserId so user::isLoggedIn() would return 
true but only account.php was actually setting the session variable used to 
refer to the current user object.  Move the $_SESSION['current'] manipulation 
into the user class so user::login() actually logs us in from the perspective 
of most of the appdb code.  Add user::logout() to keep symmetrical.  Minor 
cleanups to account.php

Chris

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