Appdb: Keep a timestamp of the last time each user has logged in

[Chris Morgan]

There are some 64k users of appdb right now.  I'd venture that most are 
inactive and have no comments attached to their accounts so they could be 
removed.  Unfortunately we don't know how long it has been since they logged 
in.  Upon login we should touch their user_list row to update the 'stamp' 
column.  In some months we can use this to tell us who is active and who 
isn't.  Added a few comments.  Removed a bunch of tabs from include/user.php 
so things are properly indented no matter your tab settings.

Chris

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