Create standard roles as part of the base schema. We will always need: 1. a gemma service user 2. an initial sys_admin user so these are now created as part of the base gemma schema. The install-db script now creates random default passwords for this accounts. As the complexity is sufficiently increased by now I also changed the Quick Start guide to use an configuration file and provided an example file.

dbhost = "gemma_db"
service-user = "paul"
service-password = "pw2Reset4"
host = "0.0.0.0"
sessions = "/tmp/gemma_session.data"
web = "./web"