[AppDB] - error logging

[Chris Morgan]

Patch modifies query_error() to log the errors to the database instead of 
displaying them on the screen.  This should let us more easily debug 
difficult or intermittent issues that users may not report.  It should also 
make the appdb more secure since we won't display any sql to users.

Add a cron to report logged errors to appdb admins every night.  Implement 
some basic unit tests to test out the error logging.

Chris
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