Clean up user class. Implement start of unit testing framework for appdb.

Implement start of user class unit test.

unit_test/run_tests.php

@@ -0,0 +1,11 @@
+<?php
+
+/* Main test function.  To add new tests include_once() */
+/* your test file here */
+
+/* TODO: test the rest of the classes we have */
+
+include_once("test_user.php");
+
+
+?>