Made database.txt to database.sql with sql comments
Now the database.sql can be used to create a database
Added more documentation in database.sql
Simplified test data for inserts
Clean style for SQL commands
Added Foreign Key Constraints
Question: table Users: isbaron & isadmin same? or 2 columns needed?
Signed-off-by: MartinMosbeck <martin.mosbeck@gmx.at>