Adds dependency on "fitnessjiffy-etl" library, and adds an ETL writer for H2.  Updates the unit tests load a full set of data into H2, and removes code that creates a test user upon server startup.  Adds missing getter/setter in the "Food" model class, and adds query methods to "FoodRepository" to find global and user-owned foods.  Updates the "User" model class, to avoid problems with JPA and enum fields by handling that conversion at the getter/setter method level.