Bugfix and minor enhancements

1. Fixed error where DB tracking module was not logging fields to database.
2. Added a script to connect to the H2 database from the command line.
3. Simplified the default config.xml for changing ports by using properties.
4. Added support for location of the config.xml using an environment variable in the start-openas2.sh file
5. Document stored_sent_filename and stored_error_filename as well as provide more examples for setting errordir and sentdir using extended dynamic variables