[AppDB] - user class cleanup and implement user class unit test

[Chris Morgan]

This patch cleans up the user class and implements a unit test for it.  To 
simplify the implementation of the unit tests I had to modify the behavior of 
update() a bit to make it similar to how we update() other classes.  I split 
password updating out into another function because we can't really have a 
member variable that holds the current user password.  I also added explicit 
failure and success values for user::login()/update()/create() so the 
addmsg() calls could be moved out of the class and into the display code 
where they belong and so we would get more finely defined failure values.

The attached files go into appdb/unit_test, a new directory that doesn't yet 
exist in cvs.

You can run the tests by running 'run_tests' in the unit_test directory.

Comments?  Questions?

Chris
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