When the service is set up, it will try to load configuration files:

1. internal file
2. /etc/textgrid/aggregator/aggregator.properties
3. ~/.aggregator.properties

The last one wins. The internal file will be filled with default values
according to the profiles selected at build time. A copy of the default
config will be generated at target/aggregator.properties; you can
generate it manually using the resources goal, e.g.:
mvn -Pesx1 resources:resources