[AppDB] - unit test for query_parameters(), fix query_parameters()

[Chris Morgan]

I noticed an odd failure in query_parameters() during some testing of a future 
sql injection patch yesterday so I figured it would be a good time to 
implement a unit test for query_parameters() so its functionality was fully 
tested and locked down.

Patch tests success and failure cases of query_parameters() with each of the 
special characters, '?', '~', '&', that can be used in place of parameters in 
an sql query.  Unit test also tests mismatches between the number of tokens 
in a query and the number of parameters provided to query_parameters().  
Fixes found during testing have been incorporated into query_parameters().

Also start to split out some unit test common functions to test_common.php.

test_common.php and test_db.php are new files that go into /appdb/unit_test

Chris

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