Removed unused classes.
ServerMain now uses a default config file if a specific config file
isn't provided. Added a unit test and some test Spring configs to suport
this feature.
AccountsService#deleteAttributeKey() now checks for references before
removing a key. Also, added an "entity in use" method to
ServiceExceptionUtils.
Removed some stale debug code.
Resolved FIXME for retrying Notification lock. Instead of retrying just
increased the timeout.
Resolved FIXME in NotifiationFactory#finalizePlan. Removed some
System.err.println() and replaced other with calls to logging.